Reference

DECO 2000 Dive Table

The dive table developed by Dr. Max Hahn for 0-700 m altitude. The CMAS training program calculates no-decompression limits with this table. Ascent rate: 10 m/min.

Open the Planner →

Post-Dive Group Letters and Deco Stops

Depth (m)	No-Deco (min)	Dive Time (min)	Deco Stops (min)Stop depth (m): 12 · 9 · 6 · 3				Group
12	140′	36					D
		54					E
		72					F
		90					G
		108					G
15	72′	24					D
		36					E
		48					E
		60					F
		72					G
		84				4	G
18	45′	15					C
		25					D
		35					E
		45					F
		55				4	F
		65				8	G
		75				14	G
21	31′	11					C
		16					D
		21					D
		26					E
		31					E
		36				2	F
		41				5	F
		46				7	F
		51				10	G
		56				13	G
		61				17	G
24	23′	7					B
		11					C
		15					D
		19					D
		23					E
		27				2	E
		31				4	F
		35				7	F
		39				9	F
		43			1	12	G
		47			2	14	G
		51			3	17	G
		55			5	19	G
27	18′	6					B
		10					C
		14					D
		18					E
		22				2	E
		26				5	F
		30				8	F
		34			2	10	F
		38			3	13	G
		42			5	15	G
		46			7	18	G
		50			9	21	G
30	15′	6					B
		9					C
		12					D
		15					D
		18				2	E
		21				4	E
		24			1	6	F
		27			2	8	F
		30			3	10	F
		33			5	12	G
		36			6	15	G
		39		1	7	17	G
		42		1	9	19	G
33	12′	6					C
		9					D
		12					D
		15				2	E
		18				5	E
		21			1	7	F
		24			3	8	F
		27			5	10	F
		30		1	5	13	G
		33		2	7	15	G
		36		3	8	18	G
36	10′	6					C
		10					D
		14				3	E
		18			2	5	F
		21			3	8	F
		24		1	4	11	F
		27		2	6	13	G
		30		3	7	16	G
		33		4	9	19	G
39	9′	6					C
		9					D
		12				3	E
		15			1	5	E
		18			3	7	F
		21		1	5	9	F
		24		3	5	13	G
		27		4	7	16	G
42	7′	4					C
		7					D
		10				2	E
		13			1	5	E
		16			4	6	F
		19		2	4	10	F
		22		3	6	13	G
		25	1	4	8	16	G

Repetitive Dive Planning

Surface Interval (h:min)

Group	Surface Interval (h:min)										Flight
G	02:00	03:00	04:00	05:00	06:00	07:00	08:00	09:00	10:00	12:00	24 hours
F	00:30	01:00	01:30	02:15	03:00	03:45	04:30	05:30	06:30	10:00	20 hours
E			00:30	01:00	01:30	02:00	02:30	03:00	03:30	08:00	16 hours
D					00:30	00:45	01:00	01:30	02:00	06:00	12 hours
C							00:10	00:20	00:30	04:00	8 hours
B								00:10	00:20	02:00	4 hours
	↓	↓	↓	↓	↓	↓	↓	↓	↓
12	66	60	54	47	41	35	30	25	20
15	52	47	42	37	32	27	23	19	16
18	43	39	34	30	26	22	19	16	13
21	36	33	29	26	22	19	16	13	11
24	31	28	25	22	19	16	14	12	10
27	27	25	22	19	17	14	12	10	8
30	24	22	20	17	15	13	11	9	8
33	22	20	18	16	14	12	10	8	7
36	20	18	16	14	12	11	9	7	6
39	18	17	15	13	11	10	8	7	6
42	17	15	14	12	10	9	8	6	5

Repetitive dive depth (m): Time to add to bottom time (min)

How to use

If your depth or time is not in the table, round up to the next value. For example, 16 m becomes 18 m and 30 min becomes 35 min.
In your post-dive group letter's row, find the interval threshold you have exceeded and move down the column to its right.
The value where that column meets your repetitive dive depth is your residual nitrogen time. Add it to the bottom time of your next dive.
Repetitive dives must always be planned shallower than the previous one.
The flight column shows the minimum surface interval before flying after a dive.

Open the Planner →

This page is for education and reference. Real dive planning must rely on the current printed table and a dive computer; using the table requires training. The recreational limit is 30 metres, and a 5-minute safety stop at 3 metres is recommended on every dive.

Source: DECO 2000 by Dr. Max Hahn, the dive table used in CMAS training (0-700 m altitude).