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University of Michigan
Sea Grant Dive Tables
Developed by Karl E. Huggins

  DANGER! READ WARNINGS!!
hugi.jpg (11380 Byte)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

© 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
http://wrigley.usc.edu/hyperbaric/hugitabl.HTM

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