ICOM IC-M506 21 Fixed Mount VHF with Hailer, N2K, Front Mic and AIS Built-in loudhailer/foghorn, NMEA 2000, and remote capability Show airs vessel traffic information on the display;Weather & alert channels Plug-and-play functionality of NMEA 2000 Large 3.4 inch LCD, reading GPS, airs, DSC and Radio menus Foghorn and RX speaker functions