The GPSMAP? 3310DS is a network-based multi-function navigator designed for Chinese users and supports Beidou, GPS and GLONASS satellite navigation systems, with a clear 10-inch LCD screen and VGA video output. The built-in NMEA0183 communication interface which supports NMEA2000 communication protocol makes it easy to expand your navigation system. The machine is equipped with a world base map and BlueChart G2 Vision China Sea Area map, which provides detailed information such as fishing areas and satellite maps. Also, the built-in professional CHIRP-level sonar module has underwater scanning imaging function. The GPSMAP? 2208DS supports the Garmim GMR? series of colorful dual-range radars to fully assist the ship's surface and underwater safety, and brings high-definition underwater images for professional fish exploration.