Garmin AIS 300 Automatic Identification System Receiverbr Receives both Class A and Class B signals simultaneously and allows mariners to independently monitor both channels br A built-in passive splitter eliminates the need for two VHF antennas - giving you more space and making installation easy without the need for additional hardware br AIS 300 receiver can be easily integrated into the Garmin network on both 12-volt and 24-volt systems