The GM600 meets the GMDSS requirements as required for SOLAS regulated commercial vessels engaging in international voyage. With the optional PS- 310 DC-DC converter, the GM600 meets the MED, "wheel mark" requirements for European merchant ships. Output Power: 25W DSC Rating: Class A NMEA: NMEA 0183 interface for GPS connection Waterproof Rating: IPX7 (front panel only) Dedicated Distress Button Distress buttonThe GM600 meets ITU class A DSC. The radio includes a dedicated DSC receiver which continuously monitors CH 70 and is independent of the main receiver and other operation. The DSC Multi-task function allows you to show up to 7 received and transmitted DSC messages. While using the DSC Multi-task screen, the operating channel is shown at the right side of the screen.