2 July 2016

Automatic Identification System (AIS)-Ship Navigation System-ETO

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AIS

The Automatic Identification System (AIS) is an automatic tracking system used on ships and by vessel traffic services (VTS) for identifying and locating vessels by electronically exchanging data with other nearby ships, AIS base stations, and satellites. When satellites are used to detect AIS signatures then the term Satellite-AIS (S-AIS) is used. AIS information supplements marine radar, which continues to be the primary method of collision avoidance for water transport.
An AIS-equipped system on board a ship presents the bearing and distance of nearby vessels in a radar-like display format.
Information provided by AIS equipment, such as unique identification, positioncourse, and speed, can be displayed on a screen or an ECDIS. AIS is intended to assist a vessel's watch standing officers and allow maritime authorities to track and monitor vessel movements. AIS integrates a standardized VHF transceiver with a positioning system such as a GPS or LORAN-C receiver, with other electronic navigation sensors, such as a gyrocompass or rate of turn indicator. Vessels fitted with AIS transceivers can be tracked by AIS base stations located along coast lines or, when out of range of terrestrial networks, through a growing number of satellites that are fitted with special AIS receivers which are capable of deconflicting a large number of signatures.
Satellite-based AIS (S-AIS) 
         
Applications

The original purpose of AIS was solely collision avoidance but many other applications have since developed and continue to be developed. AIS is currently used for:
Collision avoidance             
Fishing Fleet Monitoring and Control
Vessel traffic services
Maritime Security
Aids to navigation
Search and rescue (SAR)
Accident investigation


Maritime Mobile Service Identity (MMSI)

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Automatic Identification System (AIS)-Ship Navigation System-ETO
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