The ICOM M412 Fixed-Mount VHF Radio has built-in Class D DSC (Digital Selective Calling), which constantly monitors channel 70 and allows you to send, receive, and store messages, including distress, all ships, position request/reply, DSC test calls, and more. AquaQuake blows water away from the speaker grill. The ICOM M412 Radio also features a large LCD screen, superior receiver sensitivity, weather channel receive with alerts, dual and tri-watch functions, favorite and priority scan functions, and a common GPS/NAV interface for connecting to external GPS and navigational devices. Submersible to IPX7 standards (30 min. @ 1m). 6.5"W x 3.1"H x 5.5"D.