134
Version 2.0
Operator’s Manua
l Automatic Identification System
Position and other data are fed automatically from the ship’s sensors into the AIS
system, where the data is formatted and transmitted in a short data burst on a
dedicated VHF channel. When received on the other ships, the data is decoded
and displayed for the officer of the watch, who can view AIS reports from all other
AIS-equipped ships within range in graphic and text format. The AIS data may
optionally be fed to the ship’s integrated navigation systems and radar plotting
systems to provide AIS “tags” for radar targets. The AIS data can also be logged
to the ship’s Voyage Data Recorder (VDR) for playback and future analysis.
Updated AIS messages are transmitted every few seconds, to keep the information
up to date. Note that the ship-to-ship data exchange takes place automatically
without any action required by the watch officer on either ship. In pilotage waters,
a pilot can plug a laptop computer, loaded with his own navigation program, di-
rectly into the ship’s AIS system. In this way, the pilot can monitor the position and
movement of all other vessels in the area independent of the ship’s installed navi-
gation systems.
Summary of Contents for MX420
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