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An institution formed in 1921, consisting of representatives of maritime nations organized for the purpose of coordinating the hydrographic work of the partic- ipating governments.

Related Terms


International Aeronautical and Maritime Search and Rescue Manual published jointly by ICAO and IMO.
Consists of three volumes:

  • I Organization and Management
  • II Mission Co-ordination
  • III Mobile Facilities.


Gaining land in a wet area, such as a marsh or by the sea, by planting maritime plants to encourage silt deposition or by dumping dredged materials in the area. Also known as land reclamation.


An area of pack ice consisting of floes of any size, which is greater than 10 kilometers (5.4 nautical miles) across. Ice fields are subdivided according to areal extent. A large ice field is over 11 nautical miles across; a medium ice field is 8 to 11 nautical miles across; a small ice field is 5.4 to 8 nautical miles across. uniform system of maritime


A buoyage which is now implemented by most maritime nations. Within the single system there are two buoyage regions, designated as Region A and Region B, where lateral marks differ only in the colors of port and starboard hand marks. In Region A, red is to port on entering; in Region B, red is to starboard on entering. The system is a combined cardinal and lateral system, and applies to all fixed and floating marks, other than lighthouses, sector lights, leading lights and marks, lightships and large navigational buoys.


A Specialized Agency of the United Nations responsible for maritime safety and efficiency of navigation. The IMO provides for cooperation among governments in the field of governmental regulations and practices relating to technical matters of all kinds affecting shipping engaged in international trade: to encourage the general adoption of the highest practicable standards in matters concerning maritime safety, efficiency of navigation, and the prevention and control of marine pollution from ships, and to deal with legal matters related to the purposes set out in Article 1 of the Convention.


International Maritime Dangerous Goods Code.


Maritime Industry Training Board.


South African Maritime Safety Authority.


Transportation institute, a non-profit organization devoted to maritime research and education.


American Maritime Congress.

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