HUGI
University of Michigan Sea Grant Dive Tables
Developed by Karl E. Huggins
DANGER
READ WARNINGS!!
These tables have been developed mathematically and have not been subjected to testing to validate them. This table is more conservative than the United States Navy tables. If this table is used in the same manner as the USN tables you will have less allowed bottom time. The maximum recommended ascent rate is 40 fpm when you are between 130 and 20 fsw, and 20 fpm between 20 fsw and the surface. You should make a safety stop at between 10 - 30 fsw for three to five minutes when the depth of your dive is greater than 60 fsw. If you are within the no-decompression time limits of this table when reaching your safety stop, and the 3 - 5 minute safety stop time causes you to exceed the no-decompression limit, you will be a group "N" diver. You should wait at least 24 hours after your last dive before flying or driving over 2,000 feet.

If these or any other dive tables are used incorrectly, it is possible to develop decompression sickness which may result in severe injury or death. Although statistically less likely, it is also possible to develop decompression sickness even if these or any other dive tables are used correctly. The use of these tables to conduct multi-level dives is discouraged.

In the case of a diving accident or illness, call the Divers Alert Network (DAN) at the 24-hour emergency line (919) 684-8111.

Production of the plastic version of these tables was made possible by the National Association of Underwater Instructors (NAUI), P.O. Box 14650, Montclair, CA 91763-1150; (909) 621-5801. Distributed by the USC Catalina Hyperbaric Chamber, P.O. Box 5069, Avalon, CA 90704; (310) 510-4020.

Revised December 3, 1996.
© 1996 USC Catalina Hyperbaric Chamber
Table 1 - End-of-Dive Repetitive Letter Group
Total Time Underwater (in minutes)
Depth
(in fsw)		 End-of-Dive Repetitive Letter Group
A B C D E F G H I J K L M N
20 10 25 40 60 85 110 135 170 215 275 325 569 999
30 5 15 25 40 50 65 75 95 110 130 150 175 205 225
35 5 15 20 30 40 50 60 70 85 100 120 135 155 165
40 5 10 20 25 35 40 45 55 60 70 85 100 120 135
50 - 10 15 20 25 30 35 37 40 50 55 60 70 75
60 - 5 10 15 20 23 25 27 30 35 40 45 47 50
70 - 5 10 13 15 17 20 23 25 27 30 33 35 40
80 - 5 7 > 10 13 15 17 20 > 25 27 > 30
90 - - 5 7 > 10 > 13 15 17 > 20 23 25
100 - - - 5 7 > > 10 > > 13 15 17 20
110 - - - - 5 > 7 > > 10 > > 13 15
120 - - - - - 5 > > 7 > > 10 | |
130 - - - - - 5 | | | | | | | |

A B C D E F G H I J K L M N
Table 2 - Surface Interval Time Table
(hours:minutes)
New
Group		 Repetitive Group Letter at Start of Surface Interval
A B C D E F G H I J K L M N
N . | . | . | . | . | . | . 0:10
0:17
M . | . | . | . | . | . | 0:10
0:23		 0:18
0:32
L . | . | . | . | . | . 0:10
0:23		 0:24
0:39		 0:33
0:48
K . | . | . | . | . | 0:10
0:25		 0:24
0:41		 0:40
0:57		 0:49
1:06
J . | . | . | . | . 0:10
0:28		 0:26
0:44		 0:42
1:00		 0:58
1:16		 1:07
1:25
I . | . | . | . | 0:10
0:29		 0:29
0:50		 0:45
1:06		 1:01
1:21		 1:17
1:38		 1:26
1:47
H . | . | . | . 0:10
0:33		 0:30
0:53		 0:51
1:14		 1:07
1:30		 1:22
1:45		 1:39
2:02		 1:48
2:11
G . | . | . | 0:10
0:33		 0:34
1:01		 0:54
1:21		 1:15
1:42		 1:31
1:58		 1:46
2:13		 2:03
2:30		 2:12
2:39
F . | . | . 0:10
0:42		 0:34
1:06		 1:02
1:34		 1:22
1:54		 1:43
2:15		 1:59
2:31		 2:14
2:46		 2:31
3:03		 2:40
3:12
E . | . | 0:10
0:49		 0:43
1:23		 1:07
1:47		 1:35
2:15		 1:55
2:35		 2:16
2:56		 2:32
3:12		 2:47
3:27		 3:04
3:44		 3:13
3:53
D . | . 0:10
1:03		 0:50
1:43		 1:24
2:17		 1:48
2:41		 2:16
3:09		 2:36
3:29		 2:57
3:50		 3:13
4:06		 3:28
4:21		 3:45
4:38		 3:54
4:47
C . | 0:10
1:19		 1:04
2:20		 1:44
3:00		 2:18
3:34		 2:42
3:58		 3:10
4:26		 3:30
4:46		 3:51
5:07		 4:07
5:23		 4:22
5:38		 4:39
5:55		 4:48
6:04
B . 0:10
2:30		 1:20
3:41		 2:21
4:42		 3:01
5:22		 3:35
5:56		 3:59
6:20		 4:27
6:48		 4:47
7:08		 5:08
7:29		 5:24
7:45		 5:39
8:00		 5:56
8:17		 6:05
8:26
A 0:10
12:00		 2:31
12:00		 3:42
12:00		 4:43
12:00		 5:23
12:00		 5:57
12:40		 6:21
13:10		 6:49
13:30		 7:09
14:00		 7:30
14:20		 7:46
14:40		 8:01
14:50		 8:18
15:10		 8:27
15:30
Table 3 - Residual Nitrogen Time (min.)
Repetitive
Dive Depth
(in fsw)		 End-of-Surface Interval Repetitive Letter Group
A B C D E F G H I J K L M N
20 12
999		 28
999		 45
999		 65
999		 86
999		 111
999		 140
999		 175
999		 219
999		 279
999		 369
999		 569
999		 --
999		 --
999
30 8
217		 18
207		 29
196		 41
184		 53
172		 66
159		 80
145		 96
129		 113
112		 132
93		 154
71		 178
47		 207
18		 225
--
35 7
158		 16
149		 24
141		 34
131		 44
121		 53
112		 62
103		 73
92		 86
79		 103
62		 122
43		 139
26		 158
7		 165
--
40 6
129		 14
121		 21
114		 30
105		 37
98		 43
92		 49
86		 57
78		 65
70		 75
60		 92
43		 109
26		 128
7		 135
--
50 5
70		 11
64		 17
58		 23
52		 28
47		 32
43		 36
39		 40
35		 45
30		 51
24		 57
18		 64
11		 71
4		 75
--
60 4
46		 9
41		 14
36		 19
31		 22
28		 24
26		 27
23		 30
20		 34
16		 38
12		 43
7		 47
3		 52
--		 53
--
70 4
36		 8
32		 12
28		 15
25		 17
23		 19
21		 22
18		 24
16		 26
14		 29
11		 33
7		 37
3		 40
--		 41
--
80 3
27		 7
23		 9
21		 10
20		 12
18		 14
16		 17
13		 19
11		 21
9		 23
7		 26
4		 28
2		 30
--		 31
--
90 3
22		 6
19		 8
17		 8
17		 9
16		 11
14		 12
13		 14
11		 16
9		 18
7		 21
4		 23
2		 25
--		 26
--
100 3
17		 6
14		 6
14		 7
13		 8
12		 9
11		 10
10		 11
9		 12
8		 13
7		 16
4		 18
2		 20
--		 21
--
110 3
12		 5
10		 6
9		 6
9		 7
8		 7
8		 8
7		 9
6		 10
5		 11
4		 12
3		 13
2		 15
--		 16
--
120 2
8		 5
5		 5
5		 5
5		 6
4		 6
4		 7
3		 8
2		 8
2		 9
1		 10
--		 11
--		 12
--		 13
--
130 2
3		 4
1		 5
--		 5
--		 5
--		 6
--		 6
--		 7
--		 7
--		 8
--		 8
--		 9
--		 10
--		 11
--
000
000		 Light face numbers are Residual Nitrogen Times (RNT)
Bold-Italic numbers are Adjusted No-Decompression Limits

Return to USC Catalina Hyperbaric Chamber Home Page

© USC Catalina Hyperbaric Chamber v1.0, Released: November 1997

The USC Catalina Hyperbaric Chamber is dedicated to diving safety and treatment of Southern California diving casualties and is part of USC,.a non-profit 501(c)(3) organization FIC 95-1642394, CGEC ONAF5