Digital deep sea CLA2000, Installation And Operation Manual

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Introduction
Page 17
2 Introduction
2.1 About AIS
The marine Automatic Identification System (AIS) is a location and vessel
information reporting system. It allows vessels equipped with AIS to
automatically and dynamically share and regularly update their position,
speed, course and other information such as vessel identity with similarly
equipped vessels. Position is derived from GLONASS or GPS and
communication between vessels is by VHF digital transmissions.
Figure 1 The AIS network