Standard Horizon GX1850W Explorer-Series VHF Radio w/NMEA2000, WhiteMeets 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) 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,