tion

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. The recently
delimited Southern Ocean is not included.

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

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

This page was last updated on 8 February, 2007

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