88channel;All USA/International and Canadian marine channels;allows operation on any of the three different channel maps established for these areas;meet your needs for all channels. Easy to install; the boat emergency radio is compact in size and comes with mounting brackets and accessories for easy bracket and flush mounting. Aqua Quake draining function can remove water from the speaker grille by vibrating the speaker cone; even if water enters, there is no need to worry about the sound quality. This small compact unit includes a large easy to read LCD with a dot-matrix display; visible even in low light situations. 10 NOAA channels with weather alerts; gives you instant access to weather information; weather alerts with audible and visual alerts notify you of threatening weather near you. Waterproof marine radio;complies with IP67 waterproof standards;which means the offshore marine radio can be dropped into a body of water up to 1 meter deep for half an hour;easy to handle every wave. DSC capability includes distress and individual calling allowing you to send and receive position information between your boat and other boats. Retevis RM20 marine band radio makes DSC easy; built-in GPS; there is no need to hassle with wiring the radio to a GPS for DSC;out of the box and ready to go; DSC calling and position sharing can both be performed with just a few simple steps. Support external 3.5mm speakers; if you still feel that the volume of 110dB can not meet your needs; you can also connect louder speakers to expand the sound. The marine coast guard radio uses high-power speakers; the sound is clear and loud; the volume is up to 110dB;you can always hear the boat radios call in the noise of windy sailing;suitable for all recreational boats;fishing boats;power boats.