Cross-Reference List of Hydrographic Codes



IHO 23‑4th
Limits of Oceans and Seas, Special Publication 23, Draft 4th Edition 1986, published by the International Hydrographic Bureau of the International Hydrographic Organization
IHO 23‑3rd
Limits of Oceans and Seas, Special Publication 23, 3rd Edition 1953, published by the International Hydrographic Organization
ACIC M 49‑1
Chart of Limits of Seas and Oceans, revised January 1958, published by the Aeronautical Chart and Information Center (ACIC), United States Air Force; note--ACIC is now part of the National Imagery and Mapping Agency (NIMA)
DIAM 65‑18:
Geopolitical Data Elements and Related Features, Data Standard No. 4, Defense Intelligence Agency Manual 65-18, December 1994, published by the Defense Intelligence Agency
The US Government has not yet adopted a standard for hydrographic codes similar to the Federal Information Processing Standards (FIPS) 10-4 country codes. The names and limits of the following oceans and seas are not always directly comparable because of differences in the customers, needs, and requirements of the individual organizations. Even the number of principal water bodies varies from organization to organization. Factbook users, for example, find the Atlantic Ocean and Pacific Ocean entries useful, but none of the following standards include those oceans in their entirety. Nor is there any provision for combining codes or overcodes to aggregate water bodies.


Principal Oceans and Seas of the World With Hydrographic Codes by Institution


 
IHO 23‑4th
IHO 23‑3rd*
ACIC M 49‑1
DIAM 65‑18
2
1
B26
7B
6
49 and 48
D18 plus others
3U plus others


Oceans and Seas of the World With Hydrographic Codes by Institution


 
IHO 23‑4th
IHO 23‑3rd*
ACIC M 49‑1
DIAM 65‑18
9.2
10
A5
5P
9.3
9
A4
5K
9.4
7
A2
5B
9.5
8
A3
5W
9.7
6
B30
5N
9.8
--
--
--
9.9
15
B2
1V
9.10
16 A
A15
1U
9.11
16
A10
1H
9.12
14 A
A12
1P
9.13
17 A
A13
5L
9.15
13
A8
5U
9.16
12
A7
5C
--
--
A11
--
--
--
A14
--
2.1
1 (a)
B29
7T
2.2
1 (b)
B28
7F
2.3
1 (c)
B27
7H
2.4
2
--
--
2.7
2
B25
7K
5.2
35
F5
6W
5.3
36
--
6Q
5.4
37
F4
6E
5.5
38
F3
6D
5.7
40
F6
6M
5.8
39
F2
6R
5.10
--
F8
--
5.12
43
F10
6B
--
--
--
6U
3.1.1.1
28 (a)
B7
8S
3.1.1.2
28 (b)
--
8Y
3.1.1.4
28 (d)
B10
8L
3.1.2.1
28 (g)
B14
8D
3.1.2.3
28 (f)
B13
8N
3.1.2.4
28 (h)
B15
8G
3.2
29
B16
8M
3.3
30
B17
8B
3.4
31
B18
8Z
--
--
--
8R
--
--
--
8P
--
--
--
8C
--
--
--
8U
1.1
3
B24
1S
1.2
4
B23
1N
1.5
20
B21
1C
1.6
21 A
--
--
1.7
21
B20
1E
1.8
22
B19
1B
1.9
--
--
--
1.10
34
C4
1G
1.11
27
B6
1X
1.12
26
B5
1M
1.13
25
B4
1F
1.15
15 A
--
1L
1.16
5
A1
5G
--
--
--
9E
--
--
--
9H
--
--
--
9N
--
--
--
1J
7.1
56
D26
3P
7.9
--
D10
--
7.10
54
D8
3Q
7.11
55
D6
5D
7.13
58
D4
5F
7.16
--
D1
--
--
--
D5
--
--
--
D15
3R
--
--
D12
--
--
--
--
3I
--
--
--
3D
--
--
C6
2S
--
--
C7
2W
6
49 and 48
D18 plus others
3U plus others
6.2
--
D19
3G
6.4
--
--
--
6.5
46 (b)
--
3Z
6.6
--
--
--
6.7
48 (n)
F13
4J
6.9
48 (l)
F14
4L
6.10
48 (j)
F16
4F
6.11
--
--
--
6.12
48 (o)
F15
6S
6.13
48 (i)
F19
6T
6.16
48 (h)
E3
4U
6.17
--
--
--
6.18
48 (g)
E2
4B
6.20
48 (f)
D25
4Q
6.21
--
--
--
6.22
48 (e)
D24
3H
6.25
--
--
--
6.26
--
--
--
6.27
48 (a)
D21
3S
--
48 (b)
D22
3C
8.1
66
E6
4K
8.2
65
E7
4S
8.3
--
E5
--
8.5
64
E9
4C
8.6
63
E10
4T
8.7
62 A
F22
6F
--
--
E12
4D
--
--
E8
--
--
--
E11
4R

* The letters after the numbers are subdivisions, not footnotes.







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