"What is the no-decompression limit at 100 feet for air diving?"

"Per USN Table 9-7, the no-decompression limit (NDL) at 100 FSW on air is 25 minutes for a diver with no prior repetitive dives (Group A). At depths of 100 FSW and greater, bottom times are short and decompression planning is critical. Exceeding the NDL requires decompression stops per Table 9-9 (Air Decompression Table)."

"What is the no-decompression limit at 40 feet for air diving?"

"Per USN Table 9-7, the no-decompression limit at 40 FSW on air is 163 minutes for a Group A diver. The maximum achievable repetitive group at 40 FSW is Group O. For bottom times beyond 163 minutes, decompression stops are required per Table 9-9."

"How do repetitive dive groups work in the USN air tables?"

"After surfacing, divers are assigned a repetitive group (A through Z) from Table 9-7 based on depth and bottom time — A is lowest nitrogen loading, Z is highest. Before the next dive, use Table 9-8 Part 1 with your post-dive group and surface interval to find your new group. Then use Table 9-8 Part 2 to find your Residual Nitrogen Time (RNT) at the next planned depth. Add RNT to planned bottom time to get the Equivalent Single Dive Time (ESDT), then use Table 9-9 for the appropriate decompression schedule if the ESDT exceeds the NDL."

"What is a repetitive group designator in diving?"

"A repetitive group designator is a letter (A through Z) from the USN dive tables representing the amount of residual nitrogen dissolved in a diver's tissues after surfacing. Group A indicates the lowest nitrogen loading; Group Z indicates the highest. The designator is determined from Table 9-7 based on depth and bottom time, and is used to calculate safe bottom times for subsequent dives within the repetitive interval (typically 12 hours for air diving)."

"Can commercial divers use US Navy dive tables?"

"Yes. USN air dive tables are widely used in commercial diving and are accepted by IMCA, ADCI, and many national regulatory bodies as valid decompression procedures for surface-supplied air diving. Always use the current official edition — Revision 7 (SS521-AG-PRO-010, NAVSEA, December 2016) — and ensure all personnel are properly trained in their application. Never rely on transcribed tables for operational use without verifying against the original publication."

"What is USN Table 9-7 and what does it show?"

"Table 9-7 of the U.S. Navy Diving Manual Revision 7 is titled \"No-Decompression Limits and Repetitive Group Designators for No-Decompression Air Dives.\" For standard depths from 10 to 190 FSW, it lists the maximum no-decompression bottom time and the repetitive group letter (A–Z) accumulated at specific bottom times. It is the primary planning reference for no-decompression air dives in both naval and commercial diving operations."

"What does it mean when a depth shows unlimited NDL in the USN tables?"

"At shallow depths (10, 15, and 20 FSW), the USN tables show an \"Unlimited\" no-decompression limit. This means that no decompression stops are required regardless of bottom time at that depth alone. However, repetitive group nitrogen loading still accumulates — at 20 FSW, Group K is the maximum achievable group marked with an asterisk (*). Divers must still account for repetitive group loading when planning subsequent dives."

USN Air Dive Tables — U.S. Navy Diving Manual Rev 7

Q: "What is the no-decompression limit at 60 feet for air diving?"

"Per USN Table 9-7, the no-decompression limit (NDL) at 60 FSW on air is 63 minutes. This assumes the diver starts as Group A (no residual nitrogen from prior dives within the repetitive interval). With residual nitrogen loading from a previous dive, the adjusted bottom time will be less — use Table 9-8 to calculate the Residual Nitrogen Time and Equivalent Single Dive Time. Always verify against the official U.S. Navy Diving Manual Revision 7 (SS521-AG-PRO-010)."

Source: SS521-AG-PRO-010, U.S. Navy Diving Manual, Revision 7, 01 December 2016 NAVSEA Reference: Published by Direction of Commander, Naval Sea Systems Command

CRITICAL WARNING: These tables are transcribed from the official USN Diving Manual Revision 7. They must be verified against the original publication before operational use. Transcription errors, however unlikely, could be fatal. Always cross-reference with the official NAVSEA publication.

Opens print dialog — choose "Save as PDF" to download

Interactive NDL Lookup — Tables 9-7 & 9-8

Use this tool to instantly determine your no-decompression status, repetitive group, and residual nitrogen time for repetitive dives. All values from USN Diving Manual Rev 7.

Enter depth and bottom time to find your no-decompression status and repetitive group (Table 9-7).

Depth (FSW)

Bottom Time (min)

Plan a second dive using Table 9-8. Enter your post-dive group, surface interval, and next dive depth.

Step 1 — Surface interval credit (Table 9-8, Part 1)

Post-Dive Group

Surface Interval

Next Depth (FSW)

Verify before operational use. These values are transcribed from USN Diving Manual Rev 7 (SS521-AG-PRO-010). Cross-reference with the official NAVSEA publication before any dive. Transcription errors, however unlikely, can be fatal.

Table 9-5. Repetitive Groups Associated with Initial Ascent to Altitude

Altitude (feet)	Repetitive Group
1,000	A
2,000	A
3,000	B
4,000	C
5,000	D
6,000	E
7,000	F
8,000	G
9,000	H
10,000	I

WARNING: Altitudes above 10,000 feet can impose serious stress on the body resulting in significant medical problems while the acclimatization process takes place. Ascents to these altitudes must be slow to allow acclimatization to occur and prophylactic drugs may be required to prevent the occurrence of altitude sickness. These exposures should always be planned in consultation with a Diving Medical Officer. Commands conducting diving operations above 10,000 feet may obtain the appropriate decompression procedures from NAVSEA 00C.

Table 9-6. Required Surface Interval Before Ascent to Altitude After Diving

Times shown in h:mm format.

Rep Group	1,000 ft	2,000 ft	3,000 ft	4,000 ft	5,000 ft	6,000 ft	7,000 ft	8,000 ft	9,000 ft	10,000 ft
A	0:00	0:00	0:00	0:00	0:00	0:00	0:00	0:00	0:00	0:00
B	0:00	0:00	0:00	0:00	0:00	0:00	0:00	0:00	0:00	1:42
C	0:00	0:00	0:00	0:00	0:00	0:00	0:00	0:00	1:48	6:23
D	0:00	0:00	0:00	0:00	0:00	0:00	0:00	1:45	5:24	9:59
E	0:00	0:00	0:00	0:00	0:00	0:00	1:37	4:39	8:18	12:54
F	0:00	0:00	0:00	0:00	0:00	1:32	4:04	7:06	10:45	15:20
G	0:00	0:00	0:00	0:00	1:19	3:38	6:10	9:13	12:52	17:27
H	0:00	0:00	0:00	1:06	3:10	5:29	8:02	11:04	14:43	19:18
I	0:00	0:00	0:56	2:45	4:50	7:09	9:41	12:44	16:22	20:58
J	0:00	0:41	2:25	4:15	6:19	8:39	11:11	14:13	17:52	22:27
K	0:30	2:03	3:47	5:37	7:41	10:00	12:33	15:35	19:14	23:49
L	1:45	3:18	5:02	6:52	8:56	11:15	13:48	16:50	20:29	25:04
M	2:54	4:28	6:12	8:01	10:06	12:25	14:57	18:00	21:38	26:14
N	3:59	5:32	7:16	9:06	11:10	13:29	16:02	19:04	22:43	27:18
O	4:59	6:33	8:17	10:06	12:11	14:30	17:02	20:05	23:43	28:19
Z	5:56	7:29	9:13	11:03	13:07	15:26	17:59	21:01	24:40	29:15
Exceptional Exposure	Wait 48 hours before ascent

Notes:

When using Table 9-6, use the highest repetitive group designator obtained in the previous 24-hour period.
Table 9-6 may only be used when the maximum altitude achieved is 10,000 feet or less. For ascents above 10,000 feet, consult NAVSEA 00C for guidance.
The cabin pressure in commercial aircraft is maintained at a constant value regardless of the actual altitude of the flight. Though cabin pressure varies somewhat with aircraft type, the nominal value is 8,000 feet. For commercial flights, use a final altitude of 8,000 feet to compute the required surface interval before flying.
No surface interval is required before taking a commercial flight if the dive site is at 8,000 feet or higher. In this case, flying results in an increase in atmospheric pressure rather than a decrease.
For ascent to altitude following a non-saturation helium-oxygen dive, wait 12 hours if the dive was a no-decompression dive. Wait 24 hours if the dive was a decompression dive.

Table 9-7. No-Decompression Limits and Repetitive Group Designators for No-Decompression Air Dives

* = Highest repetitive group that can be achieved at this depth regardless of bottom time. Blank cells = Group not achievable at this depth.

Depth (fsw)	No-Stop Limit (min)	A	B	C	D	E	F	G	H	I	J	K	L	M	N	O	Z
10	Unlimited	57	101	158	245	426	*
15	Unlimited	36	60	88	121	163	217	297	449	*
20	Unlimited	26	43	61	82	106	133	165	205	256	330	461	*
25	1102	20	33	47	62	78	97	117	140	166	198	236	285	354	469	992	1102
30	371	17	27	38	50	62	76	91	107	125	145	167	193	223	260	307	371
35	232	14	23	32	42	52	63	74	87	100	115	131	148	168	190	215	232
40	163	12	20	27	36	44	53	63	73	84	95	108	121	135	151	163
45	125	11	17	24	31	39	46	55	63	72	82	92	102	114	125
50	92	9	15	21	28	34	41	48	56	63	71	80	89	92
55	74	8	14	19	25	31	37	43	50	56	63	71	74
60	63	7	12	17	22	28	33	39	45	51	57	63
70	48	6	10	14	19	23	28	32	37	42	47	48
80	39	5	9	12	16	20	24	28	32	36	39
90	33	4	7	11	14	17	21	24	28	31	33
100	25	4	6	9	12	15	18	21	25
110	20	3	6	8	11	14	16	19	20
120	15	3	5	7	10	12	15
130	12	2	4	6	9	11	12
140	10	2	4	6	8	10
150	8		3	5	7	8
160	7		3	5	6	7
170	6			4	6
180	6			4	5	6
190	5			3	5

Table 9-8. Residual Nitrogen Time Table for Repetitive Air Dives

This table has two parts:

Surface Interval Credit Table — Determines new repetitive group after a surface interval
Residual Nitrogen Times — Minutes of residual nitrogen time for the repetitive dive

Part 1: Surface Interval Credit Table

Locate your previous repetitive group designation. Read horizontally to find the column where your surface interval falls. Read down to find your new repetitive group.

* = Dives following surface intervals longer than this are not repetitive dives. Use actual bottom times in the Air Decompression Tables.

All times in h:mm format.

Previous Group	New Group: Z	O	N	M	L	K	J	I	H	G	F	E	D	C	B	A	Not Rep (>)
Z	0:10–0:52	0:53–1:44	1:45–2:37	2:38–3:29	3:30–4:21	4:22–5:13	5:14–6:06	6:07–6:58	6:59–7:50	7:51–8:42	8:43–9:34	9:35–10:27	10:28–11:19	11:20–12:13	12:14–13:30	13:31–15:50	15:50
O		0:10–0:52	0:53–1:44	1:45–2:37	2:38–3:29	3:30–4:21	4:22–5:13	5:14–6:06	6:07–6:58	6:59–7:50	7:51–8:42	8:43–9:34	9:35–10:27	10:28–11:21	11:22–12:37	12:38–14:58	14:58
N			0:10–0:52	0:53–1:44	1:45–2:37	2:38–3:29	3:30–4:21	4:22–5:13	5:14–6:06	6:07–6:58	6:59–7:50	7:51–8:42	8:43–9:34	9:35–10:29	10:30–11:45	11:46–14:05	14:05
M				0:10–0:52	0:53–1:44	1:45–2:37	2:38–3:29	3:30–4:21	4:22–5:13	5:14–6:06	6:07–6:58	6:59–7:50	7:51–8:42	8:43–9:37	9:38–10:53	10:54–13:13	13:13
L					0:10–0:52	0:53–1:44	1:45–2:37	2:38–3:29	3:30–4:21	4:22–5:13	5:14–6:06	6:07–6:58	6:59–7:50	7:51–8:44	8:45–10:01	10:02–12:21	12:21
K						0:10–0:52	0:53–1:44	1:45–2:37	2:38–3:29	3:30–4:21	4:22–5:13	5:14–6:06	6:07–6:58	6:59–7:52	7:53–9:09	9:10–11:29	11:29
J							0:10–0:52	0:53–1:44	1:45–2:37	2:38–3:29	3:30–4:21	4:22–5:13	5:14–6:06	6:07–7:00	7:01–8:16	8:17–10:36	10:36
I								0:10–0:52	0:53–1:44	1:45–2:37	2:38–3:29	3:30–4:21	4:22–5:13	5:14–6:08	6:09–7:24	7:25–9:44	9:44
H									0:10–0:52	0:53–1:44	1:45–2:37	2:38–3:29	3:30–4:21	4:22–5:16	5:17–6:32	6:33–8:52	8:52
G										0:10–0:52	0:53–1:44	1:45–2:37	2:38–3:29	3:30–4:23	4:24–5:40	5:41–8:00	8:00
F											0:10–0:52	0:53–1:44	1:45–2:37	2:38–3:31	3:32–4:48	4:49–7:08	7:08
E												0:10–0:52	0:53–1:44	1:45–2:39	2:40–3:55	3:56–6:15	6:15
D													0:10–0:52	0:53–1:47	1:48–3:03	3:04–5:23	5:23
C														0:10–0:55	0:56–2:11	2:12–4:31	4:31
B															0:10–1:16	1:17–3:36	3:36
A																0:10–2:20	2:20

Part 2: Residual Nitrogen Times (Minutes)

Enter with Dive Depth (rows) and Repetitive Group at End of Surface Interval (columns).

** = Residual Nitrogen Time cannot be determined using this table (see paragraph 9-9.1 subparagraph 8 for instructions). † = Read vertically downward to the 30 fsw repetitive dive depth. Use the corresponding residual nitrogen times to compute the equivalent single dive time. Decompress using the 30 fsw air decompression table.

Depth (fsw)	Z	O	N	M	L	K	J	I	H	G	F	E	D	C	B	A
10	**	**	**	**	**	**	**	**	**	**	**	427	246	159	101	58
15	**	**	**	**	**	**	**	**	450	298	218	164	122	89	61	37
20	**	**	**	**	**	462	331	257	206	166	134	106	83	62	44	27
25	†	†	470	354	286	237	198	167	141	118	98	79	63	48	34	21
30	372	308	261	224	194	168	146	126	108	92	77	63	51	39	28	18
35	245	216	191	169	149	132	116	101	88	75	64	53	43	33	24	15
40	188	169	152	136	122	109	97	85	74	64	55	45	37	29	21	13
45	154	140	127	115	104	93	83	73	64	56	48	40	32	25	18	12
50	131	120	109	99	90	81	73	65	57	49	42	35	29	23	17	11
55	114	105	96	88	80	72	65	58	51	44	38	32	26	20	15	10
60	101	93	86	79	72	65	58	52	46	40	35	29	24	19	14	9
70	83	77	71	65	59	54	49	44	39	34	29	25	20	16	12	8
80	70	65	60	55	51	46	42	38	33	29	25	22	18	14	10	7
90	61	57	52	48	44	41	37	33	29	26	22	19	16	12	9	6
100	54	50	47	43	40	36	33	30	26	23	20	17	14	11	8	5
110	48	45	42	39	36	33	30	27	24	21	18	16	13	10	8	5
120	44	41	38	35	32	30	27	24	22	19	17	14	12	9	7	5
130	40	37	35	32	30	27	25	22	20	18	15	13	11	9	6	4
140	37	34	32	30	27	25	23	21	19	16	14	12	10	8	6	4
150	34	32	30	28	26	23	21	19	17	15	13	11	9	8	6	4
160	32	30	28	26	24	22	20	18	16	14	13	11	9	7	5	4
170	30	28	26	24	22	21	19	17	15	14	12	10	8	7	5	3
180	28	26	25	23	21	19	18	16	14	13	11	10	8	6	5	3
190	26	25	23	22	20	18	17	15	14	12	11	9	8	6	5	3

Table 9-9. Air Decompression Table

(DESCENT RATE 75 FPM — ASCENT RATE 30 FPM)

Stop times (min) include travel time, except first air and first O2 stop. Each depth section shows AIR decompression and AIR/O2 decompression schedules.

Exposure Categories:

Entries before any marker line = Normal Exposure (No Decompression)
SurDO2 Rec = In-Water Air/O2 Decompression or Surface Decompression Using Oxygen Recommended
EE: Air / O2 Req = Exceptional Exposure: In-Water Air Decompression — In-Water Air/O2 Decompression or SurDO2 Required
EE: O2 Req = Exceptional Exposure: In-Water Air/O2 Decompression — SurDO2 Required
EE: SurDO2 = Exceptional Exposure: SurDO2 Required

30 FSW

Bottom Time (min)	Time to 1st Stop (M:S)	Gas	20 ft	Total Ascent (M:S)	Chamber O2	Rep Group	Category
371	1:00	AIR	0	1:00	0	Z	Normal
		AIR/O2	0	1:00
380	0:20	AIR	5	6:00	0.5	Z	Normal
		AIR/O2	1	2:00
420	0:20	AIR	22	23:00	0.5	Z	SurDO2 Rec
		AIR/O2	5	6:00
480	0:20	AIR	42	43:00	0.5		SurDO2 Rec
		AIR/O2	9	10:00
540	0:20	AIR	71	72:00	1		SurDO2 Rec
		AIR/O2	14	15:00
600	0:20	AIR	92	93:00	1		EE: Air / O2 Req
		AIR/O2	19	20:00
660	0:20	AIR	120	121:00	1		EE: Air / O2 Req
		AIR/O2	22	23:00
720	0:20	AIR	158	159:00	1		EE: Air / O2 Req
		AIR/O2	27	28:00

35 FSW

Bottom Time (min)	Time to 1st Stop (M:S)	Gas	20 ft	Total Ascent (M:S)	Chamber O2	Rep Group	Category
232	1:10	AIR	0	1:10	0	Z	Normal
		AIR/O2	0	1:10
240	0:30	AIR	4	5:10	0.5	Z	Normal
		AIR/O2	2	3:10
270	0:30	AIR	28	29:10	0.5	Z	SurDO2 Rec
		AIR/O2	7	8:10
300	0:30	AIR	53	54:10	0.5	Z	SurDO2 Rec
		AIR/O2	13	14:10
330	0:30	AIR	71	72:10	1	Z	SurDO2 Rec
		AIR/O2	17	18:10

40 FSW

Bottom Time (min)	Time to 1st Stop (M:S)	Gas	20 ft	Total Ascent (M:S)	Chamber O2	Rep Group	Category
163	1:20	AIR	0	1:20	0	O	Normal
		AIR/O2	0	1:20
170	0:40	AIR	6	7:20	0.5	O	Normal
		AIR/O2	2	3:20
180	0:40	AIR	14	15:20	0.5	Z	Normal
		AIR/O2	5	6:20
190	0:40	AIR	21	22:20	0.5	Z	SurDO2 Rec
		AIR/O2	7	8:20
200	0:40	AIR	27	28:20	0.5	Z	SurDO2 Rec
		AIR/O2	9	10:20
210	0:40	AIR	39	40:20	0.5	Z	SurDO2 Rec
		AIR/O2	11	12:20
220	0:40	AIR	52	53:20	0.5	Z	SurDO2 Rec
		AIR/O2	12	13:20
230	0:40	AIR	64	65:20	1	Z	SurDO2 Rec
		AIR/O2	16	17:20
240	0:40	AIR	75	76:20	1	Z	SurDO2 Rec
		AIR/O2	19	20:20
270	0:40	AIR	101	102:20	1	Z	EE: Air / O2 Req
		AIR/O2	26	27:20
300	0:40	AIR	128	129:20	1.5		EE: Air / O2 Req
		AIR/O2	33	34:20
330	0:40	AIR	160	161:20	1.5		EE: Air / O2 Req
		AIR/O2	38	44:20
360	0:40	AIR	184	185:20	2		EE: Air / O2 Req
		AIR/O2	44	50:20
420	0:40	AIR	248	249:20	2.5		EE: Air / O2 Req
		AIR/O2	56	62:20
480	0:40	AIR	321	322:20	2.5		EE: Air / O2 Req
		AIR/O2	68	79:20
540	0:40	AIR	372	373:20	3		EE: O2 Req
		AIR/O2	80	91:20
600	0:40	AIR	410	411:20	3.5		EE: O2 Req
		AIR/O2	93	104:20
660	0:40	AIR	439	440:20	4		EE: O2 Req
		AIR/O2	103	119:20
720	0:40	AIR	461	462:20	4.5		EE: SurDO2
		AIR/O2	112	128:20

45 FSW

Bottom Time (min)	Time to 1st Stop (M:S)	Gas	20 ft	Total Ascent (M:S)	Chamber O2	Rep Group	Category
125	1:30	AIR	0	1:30	0	N	Normal
		AIR/O2	0	1:30
130	0:50	AIR	2	3:30	0.5	O	Normal
		AIR/O2	1	2:30
140	0:50	AIR	14	15:30	0.5	O	Normal
		AIR/O2	5	6:30
150	0:50	AIR	25	26:30	0.5	Z	SurDO2 Rec
		AIR/O2	8	9:30
160	0:50	AIR	34	35:30	0.5	Z	SurDO2 Rec
		AIR/O2	11	12:30
170	0:50	AIR	41	42:30	1	Z	SurDO2 Rec
		AIR/O2	14	15:30
180	0:50	AIR	59	60:30	1	Z	SurDO2 Rec
		AIR/O2	17	18:30
190	0:50	AIR	75	76:30	1	Z	SurDO2 Rec
		AIR/O2	19	20:30
200	0:50	AIR	89	90:30	1	Z	EE: Air / O2 Req
		AIR/O2	23	24:30
210	0:50	AIR	101	102:30	1	Z	EE: Air / O2 Req
		AIR/O2	27	28:30
220	0:50	AIR	112	113:30	1.5	Z	EE: Air / O2 Req
		AIR/O2	30	31:30
230	0:50	AIR	121	122:30	1.5	Z	EE: Air / O2 Req
		AIR/O2	33	34:30
240	0:50	AIR	130	131:30	1.5	Z	EE: Air / O2 Req
		AIR/O2	37	43:30
270	0:50	AIR	173	174:30	2		EE: Air / O2 Req
		AIR/O2	45	51:30
300	0:50	AIR	206	207:30	2		EE: Air / O2 Req
		AIR/O2	51	57:30
330	0:50	AIR	243	244:30	2.5		EE: Air / O2 Req
		AIR/O2	61	67:30
360	0:50	AIR	288	289:30	3		EE: Air / O2 Req
		AIR/O2	69	80:30
420	0:50	AIR	373	374:30	3.5		EE: O2 Req
		AIR/O2	84	95:30
480	0:50	AIR	431	432:30	4		EE: O2 Req
		AIR/O2	101	117:30
540	0:50	AIR	473	474:30	4.5		EE: SurDO2
		AIR/O2	117	133:30

50 FSW

Bottom Time (min)	Time to 1st Stop (M:S)	Gas	20 ft	Total Ascent (M:S)	Chamber O2	Rep Group	Category
92	1:40	AIR	0	1:40	0	M	Normal
		AIR/O2	0	1:40
95	1:00	AIR	2	3:40	0.5	M	Normal
		AIR/O2	1	2:40
100	1:00	AIR	4	5:40	0.5	N	Normal
		AIR/O2	2	3:40
110	1:00	AIR	8	9:40	0.5	O	Normal
		AIR/O2	4	5:40
120	1:00	AIR	21	22:40	0.5	O	SurDO2 Rec
		AIR/O2	7	8:40
130	1:00	AIR	34	35:40	0.5	Z	SurDO2 Rec
		AIR/O2	12	13:40
140	1:00	AIR	45	46:40	1	Z	SurDO2 Rec
		AIR/O2	16	17:40
150	1:00	AIR	56	57:40	1	Z	SurDO2 Rec
		AIR/O2	19	20:40
160	1:00	AIR	78	79:40	1	Z	SurDO2 Rec
		AIR/O2	23	24:40
170	1:00	AIR	96	97:40	1	Z	EE: Air / O2 Req
		AIR/O2	26	27:40
180	1:00	AIR	111	112:40	1.5	Z	EE: Air / O2 Req
		AIR/O2	30	31:40
190	1:00	AIR	125	126:40	1.5	Z	EE: Air / O2 Req
		AIR/O2	35	36:40
200	1:00	AIR	136	137:40	1.5	Z	EE: Air / O2 Req
		AIR/O2	39	45:40
210	1:00	AIR	147	148:40	2		EE: Air / O2 Req
		AIR/O2	43	49:40
220	1:00	AIR	166	167:40	2		EE: Air / O2 Req
		AIR/O2	47	53:40
230	1:00	AIR	183	184:40	2		EE: Air / O2 Req
		AIR/O2	50	56:40
240	1:00	AIR	198	199:40	2		EE: Air / O2 Req
		AIR/O2	53	59:40
270	1:00	AIR	236	237:40	2.5		EE: Air / O2 Req
		AIR/O2	62	68:40
300	1:00	AIR	285	286:40	3		EE: Air / O2 Req
		AIR/O2	74	85:40
330	1:00	AIR	345	346:40	3.5		EE: O2 Req
		AIR/O2	83	94:40
360	1:00	AIR	393	394:40	3.5		EE: O2 Req
		AIR/O2	92	103:40
420	1:00	AIR	464	465:40	4.5		EE: SurDO2
		AIR/O2	113	129:40

55 FSW

Bottom Time (min)	Time to 1st Stop (M:S)	Gas	20 ft	Total Ascent (M:S)	Chamber O2	Rep Group	Category
74	1:50	AIR	0	1:50	0	L	Normal
		AIR/O2	0	1:50
75	1:10	AIR	1	2:50	0.5	L	Normal
		AIR/O2	1	2:50
80	1:10	AIR	4	5:50	0.5	M	Normal
		AIR/O2	2	3:50
90	1:10	AIR	10	11:50	0.5	N	Normal
		AIR/O2	5	6:50
100	1:10	AIR	17	18:50	0.5	O	SurDO2 Rec
		AIR/O2	8	9:50
110	1:10	AIR	34	35:50	0.5	O	SurDO2 Rec
		AIR/O2	12	13:50
120	1:10	AIR	48	49:50	1	Z	SurDO2 Rec
		AIR/O2	17	18:50
130	1:10	AIR	59	60:50	1	Z	SurDO2 Rec
		AIR/O2	22	23:50
140	1:10	AIR	84	85:50	1	Z	SurDO2 Rec
		AIR/O2	26	27:50
150	1:10	AIR	105	106:50	1.5	Z	EE: Air / O2 Req
		AIR/O2	30	31:50
160	1:10	AIR	123	124:50	1.5	Z	EE: Air / O2 Req
		AIR/O2	34	35:50
170	1:10	AIR	138	139:50	1.5	Z	EE: Air / O2 Req
		AIR/O2	40	46:50
180	1:10	AIR	151	152:50	2	Z	EE: Air / O2 Req
		AIR/O2	45	51:50
190	1:10	AIR	169	170:50	2		EE: Air / O2 Req
		AIR/O2	50	56:50
200	1:10	AIR	190	191:50	2		EE: Air / O2 Req
		AIR/O2	54	60:50
210	1:10	AIR	208	209:50	2.5		EE: Air / O2 Req
		AIR/O2	58	64:50
220	1:10	AIR	224	225:50	2.5		EE: Air / O2 Req
		AIR/O2	62	68:50
230	1:10	AIR	239	240:50	2.5		EE: Air / O2 Req
		AIR/O2	66	77:50
240	1:10	AIR	254	255:50	3		EE: Air / O2 Req
		AIR/O2	69	80:50
270	1:10	AIR	313	314:50	3.5		EE: O2 Req
		AIR/O2	83	94:50
300	1:10	AIR	380	381:50	3.5		EE: O2 Req
		AIR/O2	94	105:50
330	1:10	AIR	432	433:50	4		EE: O2 Req
		AIR/O2	106	122:50
360	1:10	AIR	474	475:50	4.5		EE: SurDO2
		AIR/O2	118	134:50

60 FSW

Bottom Time (min)	Time to 1st Stop (M:S)	Gas	20 ft	Total Ascent (M:S)	Chamber O2	Rep Group	Category
63	2:00	AIR	0	2:00	0	K	Normal
		AIR/O2	0	2:00
65	1:20	AIR	2	4:00	0.5	L	Normal
		AIR/O2	1	3:00
70	1:20	AIR	7	9:00	0.5	L	Normal
		AIR/O2	4	6:00
80	1:20	AIR	14	16:00	0.5	N	Normal
		AIR/O2	7	9:00
90	1:20	AIR	23	25:00	0.5	O	SurDO2 Rec
		AIR/O2	10	12:00
100	1:20	AIR	42	44:00	1	Z	SurDO2 Rec
		AIR/O2	15	17:00
110	1:20	AIR	57	59:00	1	Z	SurDO2 Rec
		AIR/O2	21	23:00
120	1:20	AIR	75	77:00	1	Z	SurDO2 Rec
		AIR/O2	26	28:00
130	1:20	AIR	102	104:00	1.5	Z	EE: Air / O2 Req
		AIR/O2	31	33:00
140	1:20	AIR	124	126:00	1.5	Z	EE: Air / O2 Req
		AIR/O2	35	37:00
150	1:20	AIR	143	145:00	2	Z	EE: Air / O2 Req
		AIR/O2	41	48:00
160	1:20	AIR	158	160:00	2	Z	EE: Air / O2 Req
		AIR/O2	48	55:00
170	1:20	AIR	178	180:00	2		EE: Air / O2 Req
		AIR/O2	53	60:00
180	1:20	AIR	201	203:00	2.5		EE: Air / O2 Req
		AIR/O2	59	66:00
190	1:20	AIR	222	224:00	2.5		EE: Air / O2 Req
		AIR/O2	64	71:00
200	1:20	AIR	240	242:00	2.5		EE: Air / O2 Req
		AIR/O2	68	80:00
210	1:20	AIR	256	258:00	3		EE: Air / O2 Req
		AIR/O2	73	85:00
220	1:20	AIR	278	280:00	3		EE: Air / O2 Req
		AIR/O2	77	89:00
230	1:20	AIR	300	302:00	3.5		EE: O2 Req
		AIR/O2	82	94:00
240	1:20	AIR	321	323:00	3.5		EE: O2 Req
		AIR/O2	88	100:00
270	1:20	AIR	398	400:00	4		EE: O2 Req
		AIR/O2	102	119:00
300	1:20	AIR	456	458:00	4.5		EE: SurDO2
		AIR/O2	115	132:00

70 FSW

Bottom Time (min)	Time to 1st Stop (M:S)	Gas	30 ft	20 ft	Total Ascent (M:S)	Chamber O2	Rep Group	Category
48	2:20	AIR		0	2:20	0	K	Normal
		AIR/O2		0	2:20
50	1:40	AIR		2	4:20	0.5	K	Normal
		AIR/O2		1	3:20
55	1:40	AIR		9	11:20	0.5	L	Normal
		AIR/O2		5	7:20
60	1:40	AIR		14	16:20	0.5	M	Normal
		AIR/O2		8	10:20
70	1:40	AIR		24	26:20	0.5	N	SurDO2 Rec
		AIR/O2		13	15:20
80	1:40	AIR		44	46:20	1	O	SurDO2 Rec
		AIR/O2		17	19:20
90	1:40	AIR		64	66:20	1	Z	SurDO2 Rec
		AIR/O2		24	26:20
100	1:40	AIR		88	90:20	1.5	Z	EE: Air / O2 Req
		AIR/O2		31	33:20
110	1:40	AIR		120	122:20	1.5	Z	EE: Air / O2 Req
		AIR/O2		38	45:20
120	1:40	AIR		145	147:20	2	Z	EE: Air / O2 Req
		AIR/O2		44	51:20
130	1:40	AIR		167	169:20	2	Z	EE: Air / O2 Req
		AIR/O2		51	58:20
140	1:40	AIR		189	191:20	2.5		EE: Air / O2 Req
		AIR/O2		59	66:20
150	1:40	AIR		219	221:20	2.5		EE: Air / O2 Req
		AIR/O2		66	78:20
160	1:20	AIR	1	244	247:00	3		EE: O2 Req
		AIR/O2	1	72	85:00
170	1:20	AIR	2	265	269:00	3		EE: O2 Req
		AIR/O2	1	78	91:00
180	1:20	AIR	4	289	295:00	3.5		EE: O2 Req
		AIR/O2	2	83	97:00
190	1:20	AIR	5	316	323:00	3.5		EE: O2 Req
		AIR/O2	3	88	103:00
200	1:20	AIR	9	345	356:00	4		EE: O2 Req
		AIR/O2	5	93	115:00
210	1:20	AIR	13	378	393:00	4		EE: O2 Req
		AIR/O2	7	98	122:00
240	1:20	AIR	25	454	481:00	5		EE: SurDO2
		AIR/O2	13	110	140:00

80 FSW

Bottom Time (min)	Time to 1st Stop (M:S)	Gas	30 ft	20 ft	Total Ascent (M:S)	Chamber O2	Rep Group	Category
39	2:40	AIR		0	2:40	0	J	Normal
		AIR/O2		0	2:40
40	2:00	AIR		1	3:40	0.5	J	Normal
		AIR/O2		1	3:40
45	2:00	AIR		10	12:40	0.5	K	Normal
		AIR/O2		5	7:40
50	2:00	AIR		17	19:40	0.5	M	SurDO2 Rec
		AIR/O2		9	11:40
55	2:00	AIR		24	26:40	0.5	M	SurDO2 Rec
		AIR/O2		13	15:40
60	2:00	AIR		30	32:40	1	N	SurDO2 Rec
		AIR/O2		16	18:40
70	2:00	AIR		54	56:40	1	O	SurDO2 Rec
		AIR/O2		22	24:40
80	2:00	AIR		77	79:40	1.5	Z	SurDO2 Rec
		AIR/O2		30	32:40
90	2:00	AIR		114	116:40	1.5	Z	EE: Air / O2 Req
		AIR/O2		39	46:40
100	1:40	AIR	1	147	150:20	2	Z	EE: Air / O2 Req
		AIR/O2	1	46	54:20
110	1:40	AIR	6	171	179:20	2	Z	EE: Air / O2 Req
		AIR/O2	3	51	61:20
120	1:40	AIR	10	200	212:20	2.5		EE: Air / O2 Req
		AIR/O2	5	59	71:20
130	1:40	AIR	14	232	248:20	3		EE: Air / O2 Req
		AIR/O2	7	67	86:20
140	1:40	AIR	17	258	277:20	3.5		EE: O2 Req
		AIR/O2	9	73	94:20
150	1:40	AIR	19	285	306:20	3.5		EE: O2 Req
		AIR/O2	10	80	102:20
160	1:40	AIR	21	318	341:20	4		EE: O2 Req
		AIR/O2	11	86	114:20
170	1:40	AIR	27	354	383:20	4		EE: O2 Req
		AIR/O2	14	90	121:20
180	1:40	AIR	33	391	426:20	4.5		EE: SurDO2
		AIR/O2	17	96	130:20
210	1:40	AIR	51	473	526:20	5		EE: SurDO2
		AIR/O2	26	110	158:20

90 FSW

Bottom Time (min)	Time to 1st Stop (M:S)	Gas	50 ft	40 ft	20 ft	Total Ascent (M:S)	Chamber O2	Rep Group	Category
33	3:00	AIR			0	3:00	0	J	Normal
		AIR/O2			0	3:00
35	2:20	AIR			4	7:00	0.5	J	Normal
		AIR/O2			2	5:00
40	2:20	AIR			14	17:00	0.5	L	Normal
		AIR/O2			7	10:00
45	2:20	AIR			23	26:00	0.5	M	SurDO2 Rec
		AIR/O2			12	15:00
50	2:20	AIR			31	34:00	1	N	SurDO2 Rec
		AIR/O2			17	20:00
55	2:20	AIR			39	42:00	1	O	SurDO2 Rec
		AIR/O2			21	24:00
60	2:20	AIR			56	59:00	1	O	SurDO2 Rec
		AIR/O2			24	27:00
70	2:20	AIR			83	86:00	1.5	Z	SurDO2 Rec
		AIR/O2			32	35:00
80	2:00	AIR		5	125	132:40	2	Z	EE: Air / O2 Req
		AIR/O2		3	40	50:40
90	2:00	AIR		13	158	173:40	2	Z	EE: Air / O2 Req
		AIR/O2		7	46	60:40
100	2:00	AIR		19	185	206:40	2.5		EE: Air / O2 Req
		AIR/O2		10	53	70:40
110	2:00	AIR		25	224	251:40	3		EE: Air / O2 Req
		AIR/O2		13	61	86:40
120	1:40	AIR	2	28	256	288:20	3.5		EE: O2 Req
		AIR/O2	2	14	70	98:40
130	1:40	AIR	5	28	291	326:20	3.5		EE: O2 Req
		AIR/O2	5	14	79	110:40
140	1:40	AIR	8	28	330	368:20	4		EE: O2 Req
		AIR/O2	8	14	87	126:40
150	1:40	AIR	11	34	378	425:20	4.5		EE: SurDO2
		AIR/O2	11	17	94	139:40
160	1:40	AIR	13	40	418	473:20	4.5		EE: SurDO2
		AIR/O2	13	20	101	151:40
170	1:40	AIR	15	45	451	513:20	5		EE: SurDO2
		AIR/O2	15	23	106	166:40
180	1:40	AIR	16	51	479	548:20	5.5		EE: SurDO2
		AIR/O2	16	26	112	176:40
240	1:40	AIR	42	68	592	704:20	7.5		EE: SurDO2
		AIR/O2	42	34	159	267:40

100 FSW

Bottom Time (min)	Time to 1st Stop (M:S)	Gas	50 ft	40 ft	30 ft	20 ft	Total Ascent (M:S)	Chamber O2	Rep Group	Category
25	3:20	AIR				0	3:20	0	H	Normal
		AIR/O2				0	3:20
30	2:40	AIR				3	6:20	0.5	J	Normal
		AIR/O2				2	5:20
35	2:40	AIR				15	18:20	0.5	L	Normal
		AIR/O2				8	11:20
40	2:40	AIR				26	29:20	1	M	SurDO2 Rec
		AIR/O2				14	17:20
45	2:40	AIR				36	39:20	1	N	SurDO2 Rec
		AIR/O2				19	22:20
50	2:40	AIR				47	50:20	1	O	SurDO2 Rec
		AIR/O2				24	27:20
55	2:40	AIR				65	68:20	1.5	Z	SurDO2 Rec
		AIR/O2				28	31:20
60	2:40	AIR				81	84:20	1.5	Z	SurDO2 Rec
		AIR/O2				33	36:20
70	2:20	AIR		11		124	138:00	2	Z	EE: Air / O2 Req
		AIR/O2		6		39	53:00
80	2:20	AIR		21		160	184:00	2.5	Z	EE: Air / O2 Req
		AIR/O2		11		45	64:00
90	2:00	AIR	2	28		196	228:40	2.5		EE: Air / O2 Req
		AIR/O2	2	14		53	82:00
100	2:00	AIR	9	28		241	280:40	3		EE: O2 Req
		AIR/O2	9	14		66	102:00
110	2:00	AIR	14	28		278	322:40	3.5		EE: O2 Req
		AIR/O2	14	14		76	117:00
120	2:00	AIR	19	28		324	373:40	4		EE: O2 Req
		AIR/O2	19	14		85	136:00
150	1:40	AIR	3	26	46	461	538:20	5		EE: SurDO2
		AIR/O2	3	26	23	109	183:40

110 FSW

Bottom Time (min)	Time to 1st Stop (M:S)	Gas	60 ft	50 ft	40 ft	30 ft	20 ft	Total Ascent (M:S)	Chamber O2	Rep Group	Category
20	3:40	AIR					0	3:40	0	H	Normal
		AIR/O2					0	3:40
25	3:00	AIR					5	8:40	0.5	I	Normal
		AIR/O2					3	6:40
30	3:00	AIR					14	17:40	0.5	K	Normal
		AIR/O2					7	10:40
35	3:00	AIR					27	30:40	1	M	SurDO2 Rec
		AIR/O2					14	17:40
40	3:00	AIR					39	42:40	1	N	SurDO2 Rec
		AIR/O2					20	23:40
45	3:00	AIR					50	53:40	1	O	SurDO2 Rec
		AIR/O2					26	29:40
50	3:00	AIR					71	74:40	1.5	Z	SurDO2 Rec
		AIR/O2					32	35:40
55	2:40	AIR			5		85	93:20	1.5	Z	EE: Air / O2 Req
		AIR/O2			3		33	44:20
60	2:40	AIR			13		111	127:20	2	Z	EE: Air / O2 Req
		AIR/O2			7		36	51:20
70	2:40	AIR			26		155	184:20	2.5	Z	EE: Air / O2 Req
		AIR/O2			14		42	64:20
80	2:20	AIR		9	28		200	240:00	2.5		EE: O2 Req
		AIR/O2		9	14		54	90:20
90	2:20	AIR		18	28		249	298:00	3.5		EE: O2 Req
		AIR/O2		18	14		68	113:20
100	2:20	AIR		25	28		295	351:00	3.5		EE: O2 Req
		AIR/O2		25	14		79	131:20
110	2:00	AIR	5	26	28		353	414:40	4		EE: O2 Req
		AIR/O2	5	26	14		91	154:00
120	2:00	AIR	10	26	35		413	486:40	4.5		EE: SurDO2
		AIR/O2	10	26	18		101	173:00
180	1:40	AIR	3	23	47	68	593	736:20	7.5		EE: SurDO2
		AIR/O2	3	23	47	34	159	298:40

120 FSW

Bottom Time (min)	Time to 1st Stop (M:S)	Gas	60 ft	50 ft	40 ft	30 ft	20 ft	Total Ascent (M:S)	Chamber O2	Rep Group	Category
15	4:00	AIR					0	4:00	0	F	Normal
		AIR/O2					0	4:00
20	3:20	AIR					4	8:00	0.5	H	Normal
		AIR/O2					2	6:00
25	3:20	AIR					9	13:00	0.5	J	Normal
		AIR/O2					5	9:00
30	3:20	AIR					24	28:00	0.5	L	SurDO2 Rec
		AIR/O2					13	17:00
35	3:20	AIR					38	42:00	1	N	SurDO2 Rec
		AIR/O2					20	24:00
40	3:00	AIR			2		49	54:40	1	O	SurDO2 Rec
		AIR/O2			1		26	30:40
45	3:00	AIR			3		71	77:40	1.5	Z	SurDO2 Rec
		AIR/O2			2		31	36:40
50	3:00	AIR			10		85	98:40	1.5	Z	EE: Air / O2 Req
		AIR/O2			5		33	46:40
55	3:00	AIR			19		116	138:40	2	Z	EE: Air / O2 Req
		AIR/O2			10		35	53:40
60	3:00	AIR			27		142	172:40	2	Z	EE: Air / O2 Req
		AIR/O2			14		39	61:40
70	2:40	AIR		13	28		190	234:20	2.5		EE: Air / O2 Req
		AIR/O2		13	14		51	86:40
80	2:40	AIR		24	28		246	301:20	3		EE: O2 Req
		AIR/O2		24	14		67	118:40
90	2:20	AIR	7	26	28		303	367:00	3.5		EE: O2 Req
		AIR/O2	7	26	14		80	140:20
100	2:20	AIR	15	25	28		372	443:00	4		EE: O2 Req
		AIR/O2	15	25	14		95	167:20
110	2:20	AIR	21	25	38		433	520:00	5		EE: SurDO2
		AIR/O2	21	25	19		105	188:20
120	2:00	AIR	3	23	25	47	480	580:40	5.5		EE: SurDO2
		AIR/O2	3	23	25	24	113	211:00

130 FSW

Bottom Time (min)	Time to 1st Stop (M:S)	Gas	70 ft	60 ft	50 ft	40 ft	30 ft	20 ft	Total Ascent (M:S)	Chamber O2	Rep Group	Category
12	4:20	AIR						0	4:20	0	F	Normal
		AIR/O2						0	4:20
15	3:40	AIR						3	7:20	0.5	G	Normal
		AIR/O2						2	6:20
20	3:40	AIR						8	12:20	0.5	I	Normal
		AIR/O2						5	9:20
25	3:40	AIR						17	21:20	0.5	K	SurDO2 Rec
		AIR/O2						9	13:20
30	3:20	AIR				2		32	38:00	1	M	SurDO2 Rec
		AIR/O2				1		17	22:00
35	3:20	AIR				5		44	53:00	1	O	SurDO2 Rec
		AIR/O2				3		23	30:00
40	3:20	AIR				6		66	76:00	1.5	Z	SurDO2 Rec
		AIR/O2				3		30	37:00
45	3:00	AIR			1	11		84	99:40	1.5	Z	EE: Air / O2 Req
		AIR/O2			1	6		33	49:00
50	3:00	AIR			2	20		118	143:40	2	Z	EE: Air / O2 Req
		AIR/O2			2	10		36	57:00
55	3:00	AIR			4	28		146	181:40	2	Z	EE: Air / O2 Req
		AIR/O2			4	14		40	67:00
60	3:00	AIR			12	28		170	213:40	2.5	Z	EE: Air / O2 Req
		AIR/O2			12	14		46	81:00
70	2:40	AIR		1	26	28		235	293:20	3		EE: O2 Req
		AIR/O2		1	26	14		63	117:40
80	2:40	AIR		12	26	28		297	366:20	3.5		EE: O2 Req
		AIR/O2		12	26	14		79	144:40
90	2:40	AIR		22	25	28		375	453:20	4		EE: O2 Req
		AIR/O2		22	25	14		95	174:40
100	2:20	AIR	6	23	26	38		444	540:00	5		EE: SurDO2
		AIR/O2	6	23	26	20		106	204:20
120	2:20	AIR	17	24	27	57		534	662:00	6		EE: SurDO2
		AIR/O2	17	24	27	29		130	255:20
180	2:00	AIR	13	21	45	57	94	658	890:40	9		EE: SurDO2
		AIR/O2	13	21	45	57	46	198	418:00

140 FSW

Bottom Time (min)	Time to 1st Stop (M:S)	Gas	70 ft	60 ft	50 ft	40 ft	20 ft	Total Ascent (M:S)	Chamber O2	Rep Group	Category
10	4:40	AIR					0	4:40	0	E	Normal
		AIR/O2					0	4:40
15	4:00	AIR					5	9:40	0.5	H	Normal
		AIR/O2					3	7:40
20	4:00	AIR					13	17:40	0.5	J	Normal
		AIR/O2					7	11:40
25	3:40	AIR				3	24	31:20	1	L	SurDO2 Rec
		AIR/O2				2	12	18:20
30	3:40	AIR				7	37	48:20	1	N	SurDO2 Rec
		AIR/O2				4	19	27:20
35	3:20	AIR			2	7	58	71:00	1.5	O	SurDO2 Rec
		AIR/O2			2	4	26	36:20
40	3:20	AIR			4	7	82	97:00	1.5	Z	EE: Air / O2 Req
		AIR/O2			4	4	33	50:20
45	3:20	AIR			5	18	114	141:00	2	Z	EE: Air / O2 Req
		AIR/O2			5	9	36	59:20
50	3:20	AIR			8	27	145	184:00	2	Z	EE: Air / O2 Req
		AIR/O2			8	14	39	70:20
55	3:00	AIR		1	15	29	171	219:40	2.5	Z	EE: Air / O2 Req
		AIR/O2		1	15	15	45	85:00
60	3:00	AIR		2	23	28	209	265:40	3		EE: O2 Req
		AIR/O2		2	23	14	56	109:00
70	3:00	AIR		14	25	29	276	347:40	3.5		EE: O2 Req
		AIR/O2		14	25	15	74	142:00
80	2:40	AIR	2	24	25	29	362	445:20	4		EE: O2 Req
		AIR/O2	2	24	25	15	91	175:40
90	2:40	AIR	12	23	26	38	443	545:20	5		EE: SurDO2
		AIR/O2	12	23	26	19	107	210:40

150 FSW

Bottom Time (min)	Time to 1st Stop (M:S)	Gas	80 ft	70 ft	60 ft	50 ft	40 ft	30 ft	20 ft	Total Ascent (M:S)	Chamber O2	Rep Group	Category
8	5:00	AIR							0	5:00	0	E	Normal
		AIR/O2							0	5:00
10	4:20	AIR							2	7:00	0.5	F	Normal
		AIR/O2							1	6:00
15	4:20	AIR							8	13:00	0.5	H	Normal
		AIR/O2							5	10:00
20	4:00	AIR					2		15	21:40	0.5	K	SurDO2 Rec
		AIR/O2					1		8	13:40
25	4:00	AIR					7		29	40:40	1	M	SurDO2 Rec
		AIR/O2					4		14	22:40
30	3:40	AIR				4	7		45	60:20	1.5	O	SurDO2 Rec
		AIR/O2				4	4		22	34:40
35	3:40	AIR				6	7		74	91:20	1.5	Z	EE: Air / O2 Req
		AIR/O2				6	4		30	44:40
40	3:20	AIR			2	6	14		106	132:00	2	Z	EE: Air / O2 Req
		AIR/O2			2	6	7		35	59:20
45	3:20	AIR			3	8	24		142	181:00	2	Z	EE: Air / O2 Req
		AIR/O2			3	8	12		40	72:20
50	3:20	AIR			4	14	28		170	220:00	2.5	Z	EE: Air / O2 Req
		AIR/O2			4	14	14		46	87:20
55	3:20	AIR			7	21	28		212	272:00	3		EE: O2 Req
		AIR/O2			7	21	14		57	113:20
60	3:20	AIR			11	26	28		248	317:00	3		EE: O2 Req
		AIR/O2			11	26	14		67	132:20
70	3:00	AIR		3	24	25	28		330	413:40	4		EE: O2 Req
		AIR/O2		3	24	25	14		85	170:00
80	3:00	AIR		15	23	26	35		430	532:40	4.5		EE: SurDO2
		AIR/O2		15	23	26	18		104	205:00
90	2:40	AIR	3	22	23	26	47		496	620:20	5.5		EE: SurDO2
		AIR/O2	3	22	23	26	24		118	239:40
120	2:20	AIR	3	20	22	23	50	75	608	804:00	8		EE: SurDO2
		AIR/O2	3	20	22	23	50	37	168	356:20
180	2:00	AIR	2	19	20	42	48	79	121	694	1027:40	10.5
		AIR/O2	2	19	20	42	48	79	58	222	538:00

160 FSW

Bottom Time (min)	Time to 1st Stop (M:S)	Gas	80 ft	70 ft	60 ft	50 ft	40 ft	20 ft	Total Ascent (M:S)	Chamber O2	Rep Group	Category
7	5:20	AIR						0	5:20	0	E	Normal
		AIR/O2						0	5:20
10	4:40	AIR						4	9:20	0.5	F	Normal
		AIR/O2						2	7:20
15	4:20	AIR					2	10	17:00	0.5	I	Normal
		AIR/O2					1	6	12:00
20	4:00	AIR				1	4	19	28:40	0.5	L	SurDO2 Rec
		AIR/O2				1	2	10	18:00
25	4:00	AIR				4	7	35	50:40	1	N	SurDO2 Rec
		AIR/O2				4	4	17	30:00
30	3:40	AIR			2	6	7	62	81:20	1.5	Z	SurDO2 Rec
		AIR/O2			2	6	4	26	42:40
35	3:40	AIR			4	6	8	89	111:20	1.5	Z	EE: Air / O2 Req
		AIR/O2			4	6	4	34	57:40
40	3:40	AIR			6	6	21	134	171:20	2	Z	EE: Air / O2 Req
		AIR/O2			6	6	11	38	70:40
45	3:20	AIR		2	5	11	28	166	216:00	2.5	Z	EE: Air / O2 Req
		AIR/O2		2	5	11	14	45	86:20
50	3:20	AIR		2	8	19	28	207	268:00	3		EE: O2 Req
		AIR/O2		2	8	19	15	55	113:20
55	3:20	AIR		3	11	26	28	248	320:00	3		EE: O2 Req
		AIR/O2		3	11	26	14	67	135:20
60	3:20	AIR		6	17	25	29	291	372:00	3.5		EE: O2 Req
		AIR/O2		6	17	25	15	77	154:20
70	3:20	AIR		15	23	26	29	399	496:00	4.5		EE: SurDO2
		AIR/O2		15	23	26	15	99	197:20
80	3:00	AIR	6	21	24	25	44	482	605:40	5.5		EE: SurDO2
		AIR/O2	6	21	24	25	23	114	237:00

170 FSW

Bottom Time (min)	Time to 1st Stop (M:S)	Gas	90 ft	80 ft	70 ft	60 ft	50 ft	40 ft	30 ft	20 ft	Total Ascent (M:S)	Chamber O2	Rep Group	Category
6	5:40	AIR								0	5:40	0	D	Normal
		AIR/O2								0	5:40
10	5:00	AIR								6	11:40	0.5	G	Normal
		AIR/O2								3	8:40
15	4:40	AIR						3		13	21:20	0.5	J	SurDO2 Rec
		AIR/O2						2		6	13:20
20	4:20	AIR					3	6		24	38:00	1	M	SurDO2 Rec
		AIR/O2					3	3		12	23:20
25	4:00	AIR				1	7	7		41	60:40	1	O	SurDO2 Rec
		AIR/O2				1	7	4		20	37:00
30	4:00	AIR				5	7	7		77	100:40	1.5	Z	EE: Air / O2 Req
		AIR/O2				5	7	3		30	50:00
35	3:40	AIR			2	6	6	15		120	153:20	2	Z	EE: Air / O2 Req
		AIR/O2			2	6	6	8		37	68:40
40	3:40	AIR			4	6	9	25		158	206:20	2.5	Z	EE: Air / O2 Req
		AIR/O2			4	6	9	12		44	84:40
45	3:40	AIR			5	7	16	28		197	257:20	2.5	Z	EE: O2 Req
		AIR/O2			5	7	16	14		53	109:40
50	3:20	AIR		1	5	11	23	28		244	316:00	3		EE: O2 Req
		AIR/O2		1	5	11	23	14		66	134:20
55	3:20	AIR		2	7	16	26	28		289	372:00	3.5		EE: O2 Req
		AIR/O2		2	7	16	26	14		77	156:20
60	3:20	AIR		2	11	21	26	28		344	436:00	4		EE: O2 Req
		AIR/O2		2	11	21	26	14		88	181:20
70	3:20	AIR		7	19	24	25	39		454	572:00	5		EE: SurDO2
		AIR/O2		7	19	24	25	20		109	228:20
80	3:20	AIR		17	22	23	26	53		525	670:00	6		EE: SurDO2
		AIR/O2		17	22	23	26	27		128	267:20
90	3:00	AIR	8	19	22	23	37	66		574	752:40	7		EE: SurDO2
		AIR/O2	8	19	22	23	37	33		148	319:00
120	2:40	AIR	9	19	20	22	42	60	94	659	928:20	9		EE: SurDO2
		AIR/O2	9	19	20	22	42	60	46	198	454:40
180	2:20	AIR	10	18	19	40	43	70	97	156	703	1159:00	11.5
		AIR/O2	10	18	19	40	43	70	97	74	229	648:00

180 FSW

Bottom Time (min)	Time to 1st Stop (M:S)	Gas	80 ft	70 ft	60 ft	50 ft	40 ft	30 ft	20 ft	Total Ascent (M:S)	Chamber O2	Rep Group	Category
6	6:00	AIR							0	6:00	0	E	Normal
		AIR/O2							0	6:00
10	5:20	AIR							8	14:00	0.5	G	Normal
		AIR/O2							4	10:00
15	4:40	AIR					2	3	14	24:20	0.5	K	SurDO2 Rec
		AIR/O2					2	2	7	16:40
20	4:20	AIR				1	5	7	29	47:00	1	M	SurDO2 Rec
		AIR/O2				1	5	3	15	29:20
25	4:20	AIR				5	6	7	57	80:00	1.5	O	SurDO2 Rec
		AIR/O2				5	6	4	24	44:20
30	4:00	AIR			3	6	6	7	95	121:40	1.5	Z	EE: Air / O2 Req
		AIR/O2			3	6	6	4	34	63:00
35	3:40	AIR		1	5	6	6	22	144	188:20	2	Z	EE: Air / O2 Req
		AIR/O2		1	5	6	6	11	41	79:40
40	3:40	AIR		2	6	5	13	28	178	236:20	2.5		EE: O2 Req
		AIR/O2		2	6	5	13	14	48	97:40
45	3:40	AIR		4	5	10	20	28	235	306:20	3		EE: O2 Req
		AIR/O2		4	5	10	20	14	63	130:40
50	3:40	AIR		4	8	13	25	29	277	360:20	3.5		EE: O2 Req
		AIR/O2		4	8	13	25	15	75	154:40
55	3:40	AIR		5	11	19	26	28	336	429:20	4		EE: O2 Req
		AIR/O2		5	11	19	26	14	87	181:40
60	3:20	AIR	1	8	13	23	25	31	406	511:00	4.5		EE: SurDO2
		AIR/O2	1	8	13	23	25	16	100	205:20
70	3:20	AIR	4	12	21	24	25	48	499	637:00	5.5		EE: SurDO2
		AIR/O2	4	12	21	24	25	24	119	253:20

190 FSW

Bottom Time (min)	Time to 1st Stop (M:S)	Gas	100 ft	90 ft	80 ft	70 ft	60 ft	50 ft	40 ft	30 ft	20 ft	Total Ascent (M:S)	Chamber O2	Rep Group	Category
5	6:20	AIR									0	6:20	0	D	Normal
		AIR/O2									0	6:20
10	5:20	AIR								2	8	16:00	0.5	H	Normal
		AIR/O2								1	4	11:00
15	4:40	AIR						1	3	3	16	28:20	0.5	K	SurDO2 Rec
		AIR/O2						1	3	2	8	19:40
20	4:20	AIR					1	2	6	7	34	55:00	1	N	SurDO2 Rec
		AIR/O2					1	2	6	4	17	35:20
25	4:20	AIR					2	6	7	7	72	99:00	1.5	Z	EE: Air / O2 Req
		AIR/O2					2	6	7	3	28	51:20
30	4:00	AIR				1	6	5	7	13	122	158:40	2	Z	EE: Air / O2 Req
		AIR/O2				1	6	5	7	7	38	74:00
35	4:00	AIR				4	5	6	8	26	165	218:40	2.5	Z	EE: O2 Req
		AIR/O2				4	5	6	8	13	45	91:00
40	3:40	AIR			1	5	5	8	17	28	217	285:20	3		EE: O2 Req
		AIR/O2			1	5	5	8	17	15	58	123:40
45	3:40	AIR			2	5	6	12	24	29	264	346:20	3.5		EE: O2 Req
		AIR/O2			2	5	6	12	24	15	71	149:40
50	3:40	AIR			3	5	10	17	26	28	324	417:20	4		EE: O2 Req
		AIR/O2			3	5	10	17	26	14	85	179:40
55	3:40	AIR			4	8	10	24	25	30	397	502:20	4.5		EE: SurDO2
		AIR/O2			4	8	10	24	25	15	99	204:40
60	3:40	AIR			5	10	16	24	25	40	454	578:20	5		EE: SurDO2
		AIR/O2			5	10	16	24	25	20	109	233:40
90	3:20	AIR		11	19	20	21	28	51	83	626	863:00	8.5		EE: SurDO2
		AIR/O2		11	19	20	21	28	51	41	178	408:20
120	3:00	AIR	15	17	19	20	37	46	79	113	691	1040:40	10.5		EE: SurDO2
		AIR/O2	15	17	19	20	37	46	79	55	219	551:00

Exceptional Exposure Depths (200-300 FSW)

NOTE: All dives to 200 FSW and deeper on air are Exceptional Exposures.

200 FSW

Bottom Time (min)	Time to 1st Stop (M:S)	Gas	90 ft	80 ft	70 ft	60 ft	50 ft	40 ft	30 ft	20 ft	Total Ascent (M:S)	Chamber O2	Rep Group
5	6:40	AIR								0	6:40	0	E
		AIR/O2								0	6:40
10	5:40	AIR							3	8	17:20	0.5	H
		AIR/O2							2	4	12:20
15	5:00	AIR					2	3	5	19	34:40	0.5	L
		AIR/O2					2	3	3	9	23:00
20	4:40	AIR				2	4	6	7	43	67:20	1	O
		AIR/O2				2	4	6	4	20	41:40
25	4:20	AIR			1	5	6	6	7	85	115:00	1.5	Z
		AIR/O2			1	5	6	6	4	32	64:20
30	4:20	AIR			4	6	5	7	19	145	191:00	2	Z
		AIR/O2			4	6	5	7	10	42	84:20
35	4:00	AIR		2	5	5	6	13	28	188	251:40	2.5
		AIR/O2		2	5	5	6	13	14	51	106:00
40	4:00	AIR		4	5	5	11	21	28	249	327:40	3.5
		AIR/O2		4	5	5	11	21	14	68	143:00
45	3:40	AIR	1	4	5	10	14	25	28	306	397:20	3.5
		AIR/O2	1	4	5	10	14	25	14	81	168:40
50	3:40	AIR	2	4	8	10	21	26	28	382	485:20	4.5
		AIR/O2	2	4	8	10	21	26	14	97	201:40

210 FSW

Bottom Time (min)	Time to 1st Stop (M:S)	Gas	100 ft	90 ft	80 ft	70 ft	60 ft	50 ft	40 ft	30 ft	20 ft	Total Ascent (M:S)	Chamber O2	Rep Group
4	7:00	AIR									0	7:00	0	D
		AIR/O2									0	7:00
5	6:20	AIR									2	9:00	0.5	E
		AIR/O2									1	8:00
10	5:40	AIR							2	3	9	20:20	0.5	I
		AIR/O2							2	2	4	14:40
15	5:00	AIR					1	3	3	6	24	42:40	1	M
		AIR/O2					1	3	3	3	12	28:00
20	4:40	AIR				1	3	5	6	7	57	84:20	1	O
		AIR/O2				1	3	5	6	4	23	47:40
25	4:40	AIR				3	6	5	7	8	110	144:20	2	Z
		AIR/O2				3	6	5	7	4	38	73:40
30	4:20	AIR			2	5	6	6	6	26	163	219:00	2.5	Z
		AIR/O2			2	5	6	6	6	13	45	93:20
35	4:00	AIR		1	4	5	6	7	18	28	223	296:40	3
		AIR/O2		1	4	5	6	7	18	14	60	130:00
40	4:00	AIR		2	5	5	7	11	26	28	278	366:40	3.5
		AIR/O2		2	5	5	7	11	26	14	76	161:00
45	4:00	AIR		4	4	6	11	18	26	28	355	456:40	4
		AIR/O2		4	4	6	11	18	26	14	91	194:00
50	3:40	AIR	1	4	5	10	12	23	26	36	432	553:20	5
		AIR/O2	1	4	5	10	12	23	26	18	105	223:40

220 FSW

Bottom Time (min)	Time to 1st Stop (M:S)	Gas	90 ft	80 ft	70 ft	60 ft	50 ft	40 ft	30 ft	20 ft	Total Ascent (M:S)	Chamber O2	Rep Group
4	7:20	AIR								0	7:20	0	E
		AIR/O2								0	7:20
5	6:40	AIR								3	10:20	0.5	E
		AIR/O2								2	9:20
10	6:00	AIR						3	4	10	23:40	0.5	J
		AIR/O2						3	2	5	17:00
15	5:20	AIR					3	2	4	7	28	50:00	1
		AIR/O2					3	2	4	4	14	33:20
20	5:00	AIR				2	4	6	6	7	70	100:40	1.5
		AIR/O2				2	4	6	6	4	26	54:00
25	4:40	AIR			1	5	6	6	6	14	133	176:20	2
		AIR/O2			1	5	6	6	6	7	41	82:40
30	4:20	AIR		1	4	5	6	6	10	28	183	248:00	2.5
		AIR/O2		1	4	5	6	6	10	14	50	106:20
35	4:20	AIR		3	5	5	5	10	22	28	251	334:00	3.5
		AIR/O2		3	5	5	5	10	22	14	68	147:20
40	4:00	AIR	1	4	5	5	9	15	26	28	319	416:40	4
		AIR/O2	1	4	5	5	9	15	26	14	84	183:00

250 FSW

Bottom Time (min)	Time to 1st Stop (M:S)	Gas	90 ft	80 ft	70 ft	60 ft	50 ft	40 ft	30 ft	20 ft	Total Ascent (M:S)	Chamber O2	Rep Group
4	7:40	AIR								4	12:20	0.5	F
		AIR/O2								2	10:20
5	7:40	AIR								7	15:20	0.5	G
		AIR/O2								4	12:20
10	6:20	AIR					2	2	4	3	15	33:00	0.5
		AIR/O2					2	2	4	2	7	24:20
15	5:40	AIR				2	2	3	4	6	7	53	83:20
		AIR/O2				2	2	3	4	6	4	22	49:40
20	5:20	AIR			2	2	4	6	6	6	11	125	168:00
		AIR/O2			2	2	4	6	6	6	6	39	82:20
25	5:00	AIR		1	4	4	5	6	6	10	28	189	258:40
		AIR/O2		1	4	4	5	6	6	10	14	51	112:00
30	4:40	AIR	1	4	4	4	5	6	9	25	28	267	358:20
		AIR/O2	1	4	4	4	5	6	9	25	15	72	160:40
35	4:40	AIR	3	4	4	5	5	10	19	26	28	363	472:20
		AIR/O2	3	4	4	5	5	10	19	26	14	93	203:40

300 FSW

Bottom Time (min)	Time to 1st Stop (M:S)	Gas	130 ft	120 ft	110 ft	100 ft	90 ft	80 ft	70 ft	60 ft	50 ft	40 ft	30 ft	20 ft	Total Ascent (M:S)	Chamber O2	Rep Group
4	9:00	AIR											3	7	19:40	0.5	G
		AIR/O2											2	4	15:40
5	8:40	AIR										3	3	8	23:20	0.5	I
		AIR/O2										3	2	4	18:40
10	7:20	AIR						2	3	2	3	4	7	35	64:00	1	N
		AIR/O2						2	3	2	3	4	4	18	44:20
15	6:20	AIR		1	2	2	3	3	5	6	7	11	125	172:00	2	Z
		AIR/O2		1	2	2	3	3	5	6	7	6	39	86:20
20	6:00	AIR	2	2	2	4	5	5	5	6	16	28	219	300:40	3
		AIR/O2	2	2	2	4	5	5	5	6	16	14	59	137:00
25	5:40	AIR	1	3	4	4	4	5	5	5	18	26	28	324	433:20	4
		AIR/O2	1	3	4	4	4	5	5	5	18	26	14	85	195:40

Table 10-1. Equivalent Air Depth Table

Purpose: For Decompression Table Selection Only. EAD values are rounded to the next greater standard depth.

Legend:

Regular values = Within 1.4 ata normal working limit
Values with (max min) = Exceeds 1.4 ata normal working limit. Requires Commanding Officer’s authorization and surface-supplied equipment. Repetitive dives not authorized. Maximum allowable exposure time shown in parentheses.
Blank cells = Depth exceeds safe limits of NITROX diving

Notes:

Depths not listed are considered beyond the safe limits of NITROX diving.
The EAD, 1.4 ata Normal Working Limit Line and Maximum Allowable Exposure Time for dives deeper than the Normal Working Limit Line are calculated assuming the diver rounds the oxygen percentage in the gas mixture using the standard rounding rule discussed in paragraph 10-4.1. The calculations also take into account the allowable ± 0.5 percent error in gas analysis.

Depth (fsw)	25% O2	26% O2	27% O2	28% O2	29% O2	30% O2	31% O2	32% O2	33% O2	34% O2	35% O2	36% O2	37% O2	38% O2	39% O2	40% O2
20	20	20	20	20	20	20	20	15	15	15	15	15	10	10	10	10
30	30	30	30	30	30	30	30	25	25	25	20	20	20	20	20	20
40	40	40	40	40	40	40	40	35	30	30	30	30	30	30	25	25
50	50	50	50	50	50	50	50	40	40	40	40	40	35	35	35	35
60	60	60	60	60	60	60	50	50	50	50	50	50	50	50	40	40
70	70	70	70	70	70	60	60	60	60	60	60	60	50	50	50	50
80	80	80	80	80	70	70	70	70	70	70	70	60	60	60	60	60
90	90	90	90	90	80	80	80	80	80	80	70	70	70 (107)	70 (80)	70 (61)	70 (47)
100	100	100	100	90	90	90	90	90	90	80 (113)	80 (82)	80 (61)	80 (46)	80 (36)	80 (29)	70 (23)
110	110	110	110	100	100	100	100	100 (96)	100 (69)	90 (51)	90 (39)	90 (30)
120	120	120	120	110	110	110 (91)	110 (64)	110 (47)	100 (35)	100 (27)
130	130	130	120	120 (95)	120 (65)	120 (47)	120 (35)	110 (26)
140	140	140 (109)	130 (73)	130 (50)	130 (36)
150	150 (89)	150 (59)	140 (41)
160	160 (50)	160 (35)

Table 2A-1. No-Decompression Limits and Repetitive Group Designators for Shallow Water Air No-Decompression Dives

Depths 30–50 FSW in 1-foot increments. Blank cells = Group not achievable at this depth.

Depth (fsw)	No-Stop Limit (min)	A	B	C	D	E	F	G	H	I	J	K	L	M	N	O	Z
30	371	17	27	38	50	62	76	91	107	125	145	167	193	223	260	307	371
31	334	16	26	37	48	60	73	87	102	119	138	158	182	209	242	282	334
32	304	15	25	35	46	58	70	83	98	114	131	150	172	197	226	261	304
33	281	15	24	34	45	56	67	80	94	109	125	143	163	186	212	243	281
34	256	14	23	33	43	54	65	77	90	104	120	137	155	176	200	228	256
35	232	14	23	32	42	52	63	74	87	100	115	131	148	168	190	215	232
36	212	14	22	31	40	50	61	72	84	97	110	125	142	160	180	204	212
37	197	13	21	30	39	49	59	69	81	93	106	120	136	153	172	193	197
38	184	13	21	29	38	47	57	67	78	90	102	116	131	147	164	184
39	173	12	20	28	37	46	55	65	76	87	99	112	126	141	157	173
40	163	12	20	27	36	44	53	63	73	84	95	108	121	135	151	163
41	155	12	19	27	35	43	52	61	71	81	92	104	117	130	145	155
42	147	11	19	26	34	42	50	59	69	79	89	101	113	126	140	147
43	140	11	18	25	33	41	49	58	67	76	87	98	109	122	135	140
44	134	11	18	25	32	40	48	56	65	74	84	95	106	118	130	134
45	125	11	17	24	31	39	46	55	63	72	82	92	102	114	125
46	116	10	17	23	30	38	45	53	61	70	79	89	99	110	116
47	109	10	16	23	30	37	44	52	60	68	77	87	97	107	109
48	102	10	16	22	29	36	43	51	58	67	75	84	94	102
49	97	10	16	22	28	35	42	49	57	65	73	82	91	97
50	92	9	15	21	28	34	41	48	56	63	71	80	89	92

Table 2A-2. Residual Nitrogen Time Table for Repetitive Shallow Water Air Dives

This table has two parts:

Surface Interval Credit — Identical to Table 9-8 Part 1 (see above). Use the same surface interval credit table to determine new repetitive group after surface interval.
Residual Nitrogen Times — Minutes of residual nitrogen time for depths 30–50 FSW in 1-foot increments.

* = Dives following surface intervals longer than the values shown in Table 9-8 Part 1 are not repetitive dives. Use actual bottom times in the Air Decompression Tables to compute decompression for such dives.

Residual Nitrogen Times (Minutes) — Depths 30–50 FSW

Enter with Dive Depth (rows) and Repetitive Group at End of Surface Interval (columns).

Depth (fsw)	Z	O	N	M	L	K	J	I	H	G	F	E	D	C	B	A
30	372	308	261	224	194	168	146	126	108	92	77	63	51	39	28	18
31	334	282	243	210	183	159	139	120	103	88	74	61	49	38	27	17
32	305	262	227	198	173	151	132	115	99	85	71	59	47	36	26	17
33	282	244	213	187	164	144	126	110	95	81	69	57	46	35	25	16
34	262	229	201	177	156	138	121	105	91	78	66	55	44	34	25	16
35	245	216	191	169	149	132	116	101	88	75	64	53	43	33	24	15
36	231	204	181	161	143	126	111	98	85	73	62	51	41	32	23	15
37	218	194	173	154	137	122	107	94	82	70	60	50	40	31	23	14
38	207	185	165	148	132	117	103	91	79	68	58	48	39	30	22	14
39	197	177	158	142	127	113	100	88	77	66	56	47	38	29	21	14
40	188	169	152	136	122	109	97	85	74	64	55	45	37	29	21	13
41	180	163	146	132	118	105	93	82	72	62	53	44	36	28	20	13
42	173	156	141	127	114	102	91	80	70	61	52	43	35	27	20	13
43	166	150	136	123	110	99	88	78	68	59	50	42	34	26	19	12
44	160	145	131	119	107	96	85	75	66	57	49	41	33	26	19	12
45	154	140	127	115	104	93	83	73	64	56	48	40	32	25	18	12
46	149	136	123	111	101	90	81	71	63	54	46	39	32	25	18	12
47	144	131	119	108	98	88	78	70	61	53	45	38	31	24	18	11
48	139	127	116	105	95	85	76	68	60	52	44	37	30	24	17	11
49	135	123	112	102	92	83	74	66	58	51	43	36	30	23	17	11
50	131	120	109	99	90	81	73	65	57	49	42	35	29	23	17	11

Frequently Asked Questions

What is the no-decompression limit at 60 feet for air diving?

Per USN Table 9-7, the NDL at 60 FSW on air is 63 minutes (Group A diver). With residual nitrogen from previous dives, use Table 9-8 to calculate adjusted bottom time.

What is the no-decompression limit at 100 feet?

Per USN Table 9-7, the NDL at 100 FSW on air is 25 minutes (Group A diver). Decompression stops are required beyond this time.

How do I calculate a repetitive dive?

Find your post-dive repetitive group from Table 9-7 (depth + bottom time)
Use Table 9-8 Part 1 (previous group + surface interval) → new group
Use Table 9-8 Part 2 (new group + next dive depth) → Residual Nitrogen Time (RNT)
Add RNT to planned bottom time → Equivalent Single Dive Time (ESDT)
If ESDT > NDL, use Table 9-9 for decompression schedule

Use the interactive tool above to perform steps 1–4 automatically.

What is the source of these tables?

SS521-AG-PRO-010, U.S. Navy Diving Manual, Revision 7, 01 December 2016 Published by Direction of Commander, Naval Sea Systems Command (NAVSEA)

Always verify against the original publication before operational use.

USN Helium-Oxygen Dive Tables — HeO2 and mixed gas tables
Dive Planning & Risk Assessment
Surface-Supplied Diving Systems
Emergency Response Frameworks
Dive Logs & Operational Records

Depth (fsw)	Z	O	N	M	L	K	J	I	H	G	F	E	D	C	B	A
10	**	**	**	**	**	**	**	**	**	**	**	427	246	159	101	58
15	**	**	**	**	**	**	**	**	450	298	218	164	122	89	61	37
20	**	**	**	**	**	462	331	257	206	166	134	106	83	62	44	27
25	†	†	470	354	286	237	198	167	141	118	98	79	63	48	34	21
30	372	308	261	224	194	168	146	126	108	92	77	63	51	39	28	18
35	245	216	191	169	149	132	116	101	88	75	64	53	43	33	24	15
40	188	169	152	136	122	109	97	85	74	64	55	45	37	29	21	13
45	154	140	127	115	104	93	83	73	64	56	48	40	32	25	18	12
50	131	120	109	99	90	81	73	65	57	49	42	35	29	23	17	11
55	114	105	96	88	80	72	65	58	51	44	38	32	26	20	15	10
60	101	93	86	79	72	65	58	52	46	40	35	29	24	19	14	9
70	83	77	71	65	59	54	49	44	39	34	29	25	20	16	12	8
80	70	65	60	55	51	46	42	38	33	29	25	22	18	14	10	7
90	61	57	52	48	44	41	37	33	29	26	22	19	16	12	9	6
100	54	50	47	43	40	36	33	30	26	23	20	17	14	11	8	5
110	48	45	42	39	36	33	30	27	24	21	18	16	13	10	8	5
120	44	41	38	35	32	30	27	24	22	19	17	14	12	9	7	5
130	40	37	35	32	30	27	25	22	20	18	15	13	11	9	6	4
140	37	34	32	30	27	25	23	21	19	16	14	12	10	8	6	4
150	34	32	30	28	26	23	21	19	17	15	13	11	9	8	6	4
160	32	30	28	26	24	22	20	18	16	14	13	11	9	7	5	4
170	30	28	26	24	22	21	19	17	15	14	12	10	8	7	5	3
180	28	26	25	23	21	19	18	16	14	13	11	10	8	6	5	3
190	26	25	23	22	20	18	17	15	14	12	11	9	8	6	5	3

Depth (fsw)	No-Stop Limit (min)	A	B	C	D	E	F	G	H	I	J	K	L	M	N	O	Z
30	371	17	27	38	50	62	76	91	107	125	145	167	193	223	260	307	371
31	334	16	26	37	48	60	73	87	102	119	138	158	182	209	242	282	334
32	304	15	25	35	46	58	70	83	98	114	131	150	172	197	226	261	304
33	281	15	24	34	45	56	67	80	94	109	125	143	163	186	212	243	281
34	256	14	23	33	43	54	65	77	90	104	120	137	155	176	200	228	256
35	232	14	23	32	42	52	63	74	87	100	115	131	148	168	190	215	232
36	212	14	22	31	40	50	61	72	84	97	110	125	142	160	180	204	212
37	197	13	21	30	39	49	59	69	81	93	106	120	136	153	172	193	197
38	184	13	21	29	38	47	57	67	78	90	102	116	131	147	164	184
39	173	12	20	28	37	46	55	65	76	87	99	112	126	141	157	173
40	163	12	20	27	36	44	53	63	73	84	95	108	121	135	151	163
41	155	12	19	27	35	43	52	61	71	81	92	104	117	130	145	155
42	147	11	19	26	34	42	50	59	69	79	89	101	113	126	140	147
43	140	11	18	25	33	41	49	58	67	76	87	98	109	122	135	140
44	134	11	18	25	32	40	48	56	65	74	84	95	106	118	130	134
45	125	11	17	24	31	39	46	55	63	72	82	92	102	114	125
46	116	10	17	23	30	38	45	53	61	70	79	89	99	110	116
47	109	10	16	23	30	37	44	52	60	68	77	87	97	107	109
48	102	10	16	22	29	36	43	51	58	67	75	84	94	102
49	97	10	16	22	28	35	42	49	57	65	73	82	91	97
50	92	9	15	21	28	34	41	48	56	63	71	80	89	92

Depth (fsw)	Z	O	N	M	L	K	J	I	H	G	F	E	D	C	B	A
30	372	308	261	224	194	168	146	126	108	92	77	63	51	39	28	18
31	334	282	243	210	183	159	139	120	103	88	74	61	49	38	27	17
32	305	262	227	198	173	151	132	115	99	85	71	59	47	36	26	17
33	282	244	213	187	164	144	126	110	95	81	69	57	46	35	25	16
34	262	229	201	177	156	138	121	105	91	78	66	55	44	34	25	16
35	245	216	191	169	149	132	116	101	88	75	64	53	43	33	24	15
36	231	204	181	161	143	126	111	98	85	73	62	51	41	32	23	15
37	218	194	173	154	137	122	107	94	82	70	60	50	40	31	23	14
38	207	185	165	148	132	117	103	91	79	68	58	48	39	30	22	14
39	197	177	158	142	127	113	100	88	77	66	56	47	38	29	21	14
40	188	169	152	136	122	109	97	85	74	64	55	45	37	29	21	13
41	180	163	146	132	118	105	93	82	72	62	53	44	36	28	20	13
42	173	156	141	127	114	102	91	80	70	61	52	43	35	27	20	13
43	166	150	136	123	110	99	88	78	68	59	50	42	34	26	19	12
44	160	145	131	119	107	96	85	75	66	57	49	41	33	26	19	12
45	154	140	127	115	104	93	83	73	64	56	48	40	32	25	18	12
46	149	136	123	111	101	90	81	71	63	54	46	39	32	25	18	12
47	144	131	119	108	98	88	78	70	61	53	45	38	31	24	18	11
48	139	127	116	105	95	85	76	68	60	52	44	37	30	24	17	11
49	135	123	112	102	92	83	74	66	58	51	43	36	30	23	17	11
50	131	120	109	99	90	81	73	65	57	49	42	35	29	23	17	11

Depth (fsw)	Z	O	N	M	L	K	J	I	H	G	F	E	D	C	B	A
10	**	**	**	**	**	**	**	**	**	**	**	427	246	159	101	58
15	**	**	**	**	**	**	**	**	450	298	218	164	122	89	61	37
20	**	**	**	**	**	462	331	257	206	166	134	106	83	62	44	27
25	†	†	470	354	286	237	198	167	141	118	98	79	63	48	34	21
30	372	308	261	224	194	168	146	126	108	92	77	63	51	39	28	18
35	245	216	191	169	149	132	116	101	88	75	64	53	43	33	24	15
40	188	169	152	136	122	109	97	85	74	64	55	45	37	29	21	13
45	154	140	127	115	104	93	83	73	64	56	48	40	32	25	18	12
50	131	120	109	99	90	81	73	65	57	49	42	35	29	23	17	11
55	114	105	96	88	80	72	65	58	51	44	38	32	26	20	15	10
60	101	93	86	79	72	65	58	52	46	40	35	29	24	19	14	9
70	83	77	71	65	59	54	49	44	39	34	29	25	20	16	12	8
80	70	65	60	55	51	46	42	38	33	29	25	22	18	14	10	7
90	61	57	52	48	44	41	37	33	29	26	22	19	16	12	9	6
100	54	50	47	43	40	36	33	30	26	23	20	17	14	11	8	5
110	48	45	42	39	36	33	30	27	24	21	18	16	13	10	8	5
120	44	41	38	35	32	30	27	24	22	19	17	14	12	9	7	5
130	40	37	35	32	30	27	25	22	20	18	15	13	11	9	6	4
140	37	34	32	30	27	25	23	21	19	16	14	12	10	8	6	4
150	34	32	30	28	26	23	21	19	17	15	13	11	9	8	6	4
160	32	30	28	26	24	22	20	18	16	14	13	11	9	7	5	4
170	30	28	26	24	22	21	19	17	15	14	12	10	8	7	5	3
180	28	26	25	23	21	19	18	16	14	13	11	10	8	6	5	3
190	26	25	23	22	20	18	17	15	14	12	11	9	8	6	5	3

Depth (fsw)	No-Stop Limit (min)	A	B	C	D	E	F	G	H	I	J	K	L	M	N	O	Z
30	371	17	27	38	50	62	76	91	107	125	145	167	193	223	260	307	371
31	334	16	26	37	48	60	73	87	102	119	138	158	182	209	242	282	334
32	304	15	25	35	46	58	70	83	98	114	131	150	172	197	226	261	304
33	281	15	24	34	45	56	67	80	94	109	125	143	163	186	212	243	281
34	256	14	23	33	43	54	65	77	90	104	120	137	155	176	200	228	256
35	232	14	23	32	42	52	63	74	87	100	115	131	148	168	190	215	232
36	212	14	22	31	40	50	61	72	84	97	110	125	142	160	180	204	212
37	197	13	21	30	39	49	59	69	81	93	106	120	136	153	172	193	197
38	184	13	21	29	38	47	57	67	78	90	102	116	131	147	164	184
39	173	12	20	28	37	46	55	65	76	87	99	112	126	141	157	173
40	163	12	20	27	36	44	53	63	73	84	95	108	121	135	151	163
41	155	12	19	27	35	43	52	61	71	81	92	104	117	130	145	155
42	147	11	19	26	34	42	50	59	69	79	89	101	113	126	140	147
43	140	11	18	25	33	41	49	58	67	76	87	98	109	122	135	140
44	134	11	18	25	32	40	48	56	65	74	84	95	106	118	130	134
45	125	11	17	24	31	39	46	55	63	72	82	92	102	114	125
46	116	10	17	23	30	38	45	53	61	70	79	89	99	110	116
47	109	10	16	23	30	37	44	52	60	68	77	87	97	107	109
48	102	10	16	22	29	36	43	51	58	67	75	84	94	102
49	97	10	16	22	28	35	42	49	57	65	73	82	91	97
50	92	9	15	21	28	34	41	48	56	63	71	80	89	92

Depth (fsw)	Z	O	N	M	L	K	J	I	H	G	F	E	D	C	B	A
30	372	308	261	224	194	168	146	126	108	92	77	63	51	39	28	18
31	334	282	243	210	183	159	139	120	103	88	74	61	49	38	27	17
32	305	262	227	198	173	151	132	115	99	85	71	59	47	36	26	17
33	282	244	213	187	164	144	126	110	95	81	69	57	46	35	25	16
34	262	229	201	177	156	138	121	105	91	78	66	55	44	34	25	16
35	245	216	191	169	149	132	116	101	88	75	64	53	43	33	24	15
36	231	204	181	161	143	126	111	98	85	73	62	51	41	32	23	15
37	218	194	173	154	137	122	107	94	82	70	60	50	40	31	23	14
38	207	185	165	148	132	117	103	91	79	68	58	48	39	30	22	14
39	197	177	158	142	127	113	100	88	77	66	56	47	38	29	21	14
40	188	169	152	136	122	109	97	85	74	64	55	45	37	29	21	13
41	180	163	146	132	118	105	93	82	72	62	53	44	36	28	20	13
42	173	156	141	127	114	102	91	80	70	61	52	43	35	27	20	13
43	166	150	136	123	110	99	88	78	68	59	50	42	34	26	19	12
44	160	145	131	119	107	96	85	75	66	57	49	41	33	26	19	12
45	154	140	127	115	104	93	83	73	64	56	48	40	32	25	18	12
46	149	136	123	111	101	90	81	71	63	54	46	39	32	25	18	12
47	144	131	119	108	98	88	78	70	61	53	45	38	31	24	18	11
48	139	127	116	105	95	85	76	68	60	52	44	37	30	24	17	11
49	135	123	112	102	92	83	74	66	58	51	43	36	30	23	17	11
50	131	120	109	99	90	81	73	65	57	49	42	35	29	23	17	11

Interactive NDL Lookup — Tables 9-7 & 9-8#

Table 9-5. Repetitive Groups Associated with Initial Ascent to Altitude#

Table 9-6. Required Surface Interval Before Ascent to Altitude After Diving#

Table 9-7. No-Decompression Limits and Repetitive Group Designators for No-Decompression Air Dives#

Table 9-8. Residual Nitrogen Time Table for Repetitive Air Dives#

Part 1: Surface Interval Credit Table#

Part 2: Residual Nitrogen Times (Minutes)#

Table 9-9. Air Decompression Table#

30 FSW#

35 FSW#

40 FSW#

45 FSW#

50 FSW#

55 FSW#

60 FSW#

70 FSW#

80 FSW#

90 FSW#

100 FSW#

110 FSW#

120 FSW#

130 FSW#

140 FSW#

150 FSW#

160 FSW#

170 FSW#

180 FSW#

190 FSW#

Exceptional Exposure Depths (200-300 FSW)#

200 FSW#

210 FSW#

220 FSW#

250 FSW#

300 FSW#

Table 10-1. Equivalent Air Depth Table#

Table 2A-1. No-Decompression Limits and Repetitive Group Designators for Shallow Water Air No-Decompression Dives#

Table 2A-2. Residual Nitrogen Time Table for Repetitive Shallow Water Air Dives#

Residual Nitrogen Times (Minutes) — Depths 30–50 FSW#

Frequently Asked Questions#

What is the no-decompression limit at 60 feet for air diving?#

What is the no-decompression limit at 100 feet?#

How do I calculate a repetitive dive?#

What is the source of these tables?#

Related Topics#