Standard Horizon GX2400GPS, Owner'S Manual

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14 AUTOMATIC IDENTIFICATION SYSTEM (AIS)
14.1 GENERAL
NOTE
The GX2400 does not require a special marine VHF antenna to receive AIS
transmissions. The GX2400 does not transmit AIS signals, it is NOT recom -
mended to use an antenna dedicated for AIS operation.
The Automatic Identification System (AIS) is a short range coastal tracking
system. AIS is intended to assist in collision avoidance by seeing positions and
courses of AIS equipped vessels around your vessel.
AIS is mandatory on passenger ships, irrespective of size, all ships 300 gross
tonnage and larger engaged on international voyages, cargo ships of 500 gross
tonnage and larger not engaged on international voyages.
AIS uses two marine VHF channels. Each ship equipped with an AIS transpon
-
der transmits a packet every few seconds with information about the ship and
its voyage. Radio frequencies: AIS1 = 161.975 MHz and AIS2 = 162.025 MHz.
A stand-alone AIS receiver or the AIS receiver built in to a Class A or Class B
transponder can pick up these radio signals and translate them into a NMEA
data sentence that can be understood by a computer with the proper software
or by an AIS-enabled chart plotter.
Classes of AIS:
Class A - 12.5W power output - mandated for use on SOLAS Chapter V vessels
(and others in some countries).
Class B CS - 2W output - lower cost derivative for leisure and non-SOLAS markets.
The GX2400 is capable of receiving Class A and Class B CS transmissions with
the internal Dual Channel AIS receiver.
14.2 AIS OPERATION
The
GX2400
is equipped with an AIS receiver and can display AIS targets
around your vessel on the radio's display. Therefore, you can identify and avoid
in proximity to your vessel.
NOTE
To show AIS targets on the radio’s display, the internal or external GPS
needs to be fixed own location so the radio knows its position relative to the
AIS targets.
1.
[ ]

“ AIS ”