Garmin GPSMAP 420S Marine GPS Receiver

Features Model Number: GRM0051520 Unit dimensions, WxHxD: 5.7 x 5.0 x 2.7 in Display size, WxH: 2.4 x 3.2 in, 4.0 in diagonal Display resolution, WxH: 240 x 320 pixels Display type: QVGA display Weight: 1.3 lb Waterproof Antenna: internal NMEA output: NMEA 0183 Basemap Ability to add maps Accepts data cards: SD card slot Waypoints: 1, 500 Routes: 20 Track log: 10, 000 points; 20 saved tracks Garmin sonar compatible CANet(tm) compatible Supports AI Supports DSC Audible alarms Tide tables Sun and moon information 3D map view Auto Guidance