The MRF77 is a unique VHF radio with an integrated GPS receiver and exact location for a true life-saving device. Instant emergency channel 16/9, Rewind-Say-Again feature, and access to all NOAA weather channels make this a complete solution.. Submersible. 25 Watt VHF. Noise-Canceling Microphone. NOAA Weather Channels. Rewind-Say-Again