Garmin GPSMap 420 Sounder

Unit dimensions, WxHxD: 5.7" x 5.0" x 2.7" (14.5 x 12.7 x 6.9 cm) Display size, WxH: 2.4" x 3.2", 4.0" diagonal (6.1 x 8.1 cm, 10.2 cm diagonal) Display resolution, WxH: 240 x 320 pixels Display type: QVGA display Weight: 1.3 lb (590 g) Battery: none Battery life: none Waterproof: yes (IPX7) Antenna: internal NMEA input/output: NMEA 0183 RoHS version available: no Maps & Memory: Basemap: yes Preloaded maps: no Ability to add maps: yes Built-in memory: none (cannot load maps to internal memory) Accepts data cards: SD card slot Waypoints/favorites: 1,500 Routes: 20 Track log: 10,000 points; 20 saved tracks Features: Garmin radar compatible: no Garmin sonar compatible: yes CANet锟 compatible: yes Garmin Marine Network锟 compatible: no Supports AIS (tracks target ships' position): yes Supports DSC (displays position data from DSC capable VHF radio): yes Audible alarms: yes Tide tables: yes Hunt/fish calendar: no Sun and moon information: yes 3D map view: yes (with optional BlueChart g2 Vision card) Auto Guidance: yes (with optional BlueChart g2 Vision card) Automatic routing (turn by turn routing on roads): no XM WX Weather & Radio for U.S. compatible: no Voice prompts (e.g. "Turn right in 500 ft."): no Remote control: no Headphone jack/audio line-out: no Audio/video input/output: no Portable: no Automotive/motorcycle-friendly: no