Standard Horizon GX1850 Fixed Mount VHF - NMEA 2000 - Black [GX1850B]GX1850 Fixed Mount VHF NMEA 2000 Black NMEA2000 Compatible Easy plug and play connectivity to the NMEA bus. A single plug in interface allows connectivity of GPS data, and DSC calling between compatible devices. Second Station RAM4 compatibility Now compatible with Standard Horizon's latest second station microphone RAM4, model SSM 70. All functions on the main radio can now be controlled on the Second Station RAM4, this includes all radio functions,