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The Acoustic Doppler Current Profiler (ADCP) measures currents beneath a ship while underway. Sound signals sent from the moving ship bounce back to receivers aboard the ship. This provides a profile of water movement relative to the ship-precise modern navigation, allowing the ship's motion to be subtracted from the data. These devices are also used on moorings and profilers and, along with acoustic backscattering, measure animal biomass. Particles in the path of the sound waves, mostly plankton, reflect a small part of the sound energy back toward receivers, allowing researchers to make remote estimates of the sizes and numbers of animals present in the water column. Before the 1970's, the most technologically advanced instrument used to measure water velocity was known as a Doppler speed log. This evolved into the first commercial ADCP, produced in the mid-1970's, which used averaging. Later in the 1970's, the first vessel-mounted ADCP was developed to measure water velocity more accurately and to allow measurement in range cells over a depth profile.

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            <gco:CharacterString>Updated information from ICES for the vessel KAIYO MARU from JAPAN(JP).

Name : KAIYO MARU
Country(s) : JAPAN(JP) (ISO Country Code)
Platform Class : 31 Research vessel
Synonyms: KAIYO-MARU
Call Sign : JNZL
MMSI: 431025000
IMO : 8920012
Commissioned Date : 1991-07-31
Current Length : 93.1
Built : 1991-07-31
WOD Code: 10244
Notes : Operated by Japan Fisheries Agency.

Information Sources:
- http://www.jodc.go.jp/JGOFS_DMO/testpage/Ships/Kaiyo-maru.htm
- http://www.marinetraffic.com/ais/details/ships/shipid:662261/mmsi:431025000/imo:8920012/vessel:KAIYO_MARU
- http://www.shipspotting.com/gallery/photo.php?lid=1073365

Confirmed by NOAA on 2015-09-28.
Submitted to ICES 2015-03-31.</gco:CharacterString>
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