Black box AIS 300 receiver integrates with a Garmin chartplotter and VHF radio to enable automatic AIS monitoring, target calling and display of AIS target data directly on the chartplotter screen. To ensure no loss of information, dual-channel monitoring allows for independent monitoring of both AIS channels. Includes both Class A and Class B reception. AIS 300 integrates Closest Point of Approach (CPA) alarm when connected to a compatible chartplotter. NMEA 2000 certified (also outputs NMEA 0183) and is easily added to an existing NMEA 2000 network. Compatible with both 12V and 24V electrical systems. A built-in passive splitter enables one VHF antenna to serve both the AIS 300 and any VHF radio. Dimensions: 8.2"W x 5.5"H x 1.8"D.