cal 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 IHO ACIC DIAM
23-4th 23-3rd* M 49-1 65-18

Arctic Ocean 9 17 A 5A
Atlantic Ocean -- -- -- --
North Atlantic Ocean 1 23 B 1A
South Atlantic Ocean 4 32 C 2A
Baltic Sea 2 1 B26 7B
Indian Ocean 5 45 F 6A
Mediterranean Sea 3.1 28 B11 --
Eastern Mediterranean 3.1.2 28 B -- 8E
Western Mediterranean 3.1.1 28 A -- 8W
Pacific Ocean -- -- -- --
North Pacific Ocean 7 57 D 3A
South Pacific Ocean 8 61 E 4A
South China and Eastern 6 49 and 48 D18 plus 3U plus
Archipelagic Seas others others

ARCTIC OCEAN 9 17 A 5A
East Siberian Sea 9.1 11 A6 5S
Laptev Sea 9.2 10 A5 5P
Kara Sea 9.3 9 A4 5K
Barents Sea 9.4 7 A2 5B
White Sea 9.5 8 A3 5W
North Greenland Sea 9.6 --