Cobra MR F75B Dual-Power VHF Marine Tri-Watch Transceiver Cobra Dual Power VHF Marine Transceiver with USA, Canada, and International Channels and 10 NOAA Weather Channels One button digital selective calling meets requirements for RTCM-SC101 Digital Selective Calling Instant channel 16/9 allows instant access to channel 16 and channel 9 for emergency situations/Weather alert GPS capability when connected to a Cobra or most other GPS receivers, you can send your position to other boats in an emergency Tri Watch monitors three channels at once - Channel 16, Channel 9, and one user selected channel/Memory scan