The Number of AIS Vessels That can be Displayed on a Garmin Chartplotter

The GPSMAP 3xxx series of chartplotters are compatible with NMEA 0183 compliant AIS vessel tracking systems, such as the Garmin AIS 300 and AIS 600.

The GPSMAP 3xxx devices are only able to track 30 AIS targets at one time. Newer devices, 2013 and later, are able to track up to 100 AIS targets at one time. It is not possible to select which targets will be tracked on the device.