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Garmin GPSMAP 420S Marine GPS

Physical & Performance:

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)
High-sensitivity receiver: no
Antenna: internal
NMEA input/ output: NMEA 0183
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: SDâ„¢ card slot
Waypoints/ favorites/ locations: 1, 500
Routes: 20
Track log: 10, 000 points; 20 saved tracks
Features:

Garmin radar compatible: no
Garmin sonar compatible: yes
Garmin Marine Networkâ„¢ compatible: no
Touchscreen: 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
3-D map view: yes ( with optional BlueChart g2 Vision card)
Auto Guidance: yes ( with optional BlueChart g2 Vision card)
XM WX Weather & Radio for U.S. & Canada compatible: no
Automatic routing ( turn by turn routing on roads) : no
Voice prompts ( e.g. " Turn right in 500 ft." ) : no
Speaks street names ( e.g. " Turn right ON ELM STREET in 500 ft." ) : no
Headphone jack/ audio line-out: no
Audio/ video input/ output: no
Portable: no
Automotive/ motorcycle-friendly: no