Class B NMEA 2000® AIS Receiver with VHF/GPS Antenna by Digital Yacht®. The CLB2000 uses the latest AIS Transponder technology to squeeze more performance and interfacing options in to a housing that is half the size of previous generation transponder. This ultra-compact Class B Transponder has three outputs; NMEA0183, NMEA 2000® and USB connection, allowing it to work with every AIS compatible chart plotter or software package on the market today.