What Is The Range For Ais Receivers - Standard Horizon GX2200 Owner's Manual

5.10 WHAT IS THE RANGE FOR AIS RECEIVERS?

Since AIS uses similar frequencies as a marine VHF radio, it has similar
radio reception capabilities - which are basically line of sight. This means
that the higher the VHF antenna is mounted, the greater the reception area
will be. Reception from Class A vessels that are 20 or even 30 miles away
on open water is not uncommon as their antennas are mounted high off the
water. Class B transponders use lower power for transmissions; therefore
you can expect Class B vessels to be acquired when they are 5 to 10 miles
away.
The GX2200 does not require a special marine VHF antenna to
receive AIS transmissions. The GX2200 does not transmit AIS
signals, it is NOT recommended to use an antenna dedicated for AIS
operation.
For additional information on AIS visit the USCG website:
<http://www.navcen.uscg.gov/marcomms/ais.htm>
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