Icom M506 41 M506 VHF Mount with Hailer/AIS/N2K/Rear Mic Built-in loudhailer/foghorn, NMEA 2000, and remote capability Show AIS vessel traffic information on the display Plug-and-play functionality of NMEA 2000 Large 3.4 inch LCD, reading GPS, AIS, DSC and Radio menus Foghorn and RX speaker functions