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GPSMAP 78 series GPS by

 
Unit dimensions, WxHxD: 6.6 x 15.2 x 3.0 cm 6.6 x 15.2 x 3.0 cm 6.6 x 15.2 x 3.0 cm
Display size, WxH: 4.1 x 5.6 cm, diag 6.6 cm 4.1 x 5.6 cm, diag 6.6 cm 4.1 x 5.6 cm, diag 6.6 cm
Display resolution, WxH: 160 x 240 pixels 160 x 240 pixels 160 x 240 pixels
Display type: transflective, 65-K color TFT transflective, 65-K color TFT transflective, 65-K color TFT
Weight: 218 g with batteries 218 g with batteries 218 g with batteries
Battery: 2 AA batteries (not included); NiMH or Lithium recommended 2 AA batteries (not included); NiMH or Lithium recommended 2 AA batteries (not included); NiMH or Lithium recommended
Battery life: 20 hours 20 hours 20 hours
Waterproof: yes (IPX7) yes (IPX7) yes (IPX7)
Floats: yes yes yes
High-sensitivity receiver: yes yes yes
Interface: USB and NMEA 0183 compatible high-speed USB and NMEA 0183 compatible high-speed USB and NMEA 0183 compatible
RoHS version available: yes yes yes
Basemap: yes yes yes
Preloaded maps: no no no
Ability to add maps: yes yes yes
Built-in memory: 1.7 GB 1.7 GB 1.7 GB
Accepts data cards: microSD™ card (not included) microSD™ card (not included) microSD™ card (not included)
Waypoints/favorites/locations: 2000 2000 2000
Routes: 200 200 200
Track log: 10,000 points, 200 saved tracks 10,000 points, 200 saved tracks 10,000 points, 200 saved tracks
Automatic routing (turn by turn routing on roads): yes (with optional mapping for detailed roads) yes (with optional mapping for detailed roads) yes (with optional mapping for detailed roads)
Touchscreen: no no no
Electronic compass: no yes (tilt-compensated, 3-axis) yes (tilt-compensated, 3-axis)
Barometric altimeter: no yes yes
Maps/charts: Optional Optional Aust & NZ Marine Charts loaded
Camera: no no no
Photo navigation (navigate to geotagged photos): yes yes yes
Picture viewer: no no no
Custom maps compatible: yes yes yes
Geocaching-friendly: yes (paperless) yes (paperless) yes (paperless)
Outdoor GPS games: no no no
Hunt/fish calendar: yes yes yes
Sun and moon information: yes yes yes
Tide tables: yes yes yes
Area calculation: yes yes yes
Custom POIs (ability to add additional points of interest): yes yes yes
Unit-to-unit transfer (shares data wirelessly with similar units): no yes yes
Garmin Connect™ compatible (online community where you analyze, categorize and share data): yes yes yes