mcmurdo Smartfind M10, User Manual

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1.4 What is AIS?
The Automatic Identification System (AIS) is a Very High Frequency (VHF)
radio broadcasting system that transfers packets of data over the VHF data
link (VDL) and enables AIS equipped vessels and shore-based stations to
exchange identification information and navigational data. Ships with AIS
transponders continually transmit their ID, position, course, speed and
other data to all nearby ships and shore stations. Such information can aid
greatly in situational awareness and provide a means to assist in collision
avoidance.
AIS equipment is standardized by ITU, IEC, IALA and IMO and is subject to
approval by a certification body. The following AIS devices have been
developed for various applications.
 AIS Class A:
mandated by the IMO for vessels of 300 gross tonnages and
upwards, engaged on international voyages, cargo ships of 500
gross tonnages and upwards, as well as passenger ships. It
typically transmits using 12.5W output power.
 AIS Class B:
provides limited functionality and is intended for non-SOLAS
commercial vessels and recreational vessels. It typically
transmits using 2W output power.