Meets ITU-R M.493-13 Class D DSC (Digital Selective Calling). Separate Receiver for CH70 (Receiving DSC Calls). Ultra-slim and compact Rear case design (Depth 3.3 in. ). NMEA2000 Compatible (GX1850GPS/GX1850). NMEA 0183 Connectivity. E2O (Easy to Operate) Icon & Menu System. Preset key stores up to 10 favorite channels. Second Station Remote Microphone (Optional RAM4 SSM-70H). Intercom Feature between the Radio and an Optional Second Station. Programmable Scan, Priority Scan, and Multi Watch. Automatic DSC polling of up to 6 ships GPS positions. GPS Compass, Waypoint and GPS status pages*. Enter, Save, and Navigate to a waypoint using the Compass page*. Navigation (LAT/LON, SOG, and COG) information shown on display*. GM (Group Monitor) Using DSC Group position Calling. MOB (Man over Board) Operation. Selectable Night Mode Display. Noise canceling microphone with channel change selection, 16/S and H/L keys. NOAA Weather channels with weather Alert* When connected to GPS.