Garmin Signal™ VHF 400 Radio with Built-In AIS Transponder. Stay aware on the water with built-in AIS transmit and receive capabilities. This feature shows you range, course, speed and the crossing situation of other AIS-equipped vessels around you to help you navigate. The compact and modern design features edge-to-edge glass and 3.5" color touchscreen display. Eliminate unnecessary radio noise with automated squelch. If you miss a radio message, you can replay it with VHF audio playback. When you need to maintain watch on multiple channels, advanced watch modes make it easy. Uses Class D DSC to automatically send crucial information that can help emergency responders. Easy to configure and update with smartphone app via built-in Wi-Fi® connectivity.