For boaters and watersports enthusiasts who want to run with the best, the rugged GPSMAP 78s features a 3-axis compass, barometric altimeter, crisp color mapping, high-sensitivity receiver, new molded rubber side grips, plus a microSDâ„¢ card slot for loading additional maps. And it floats!
Explore

GPSMAP 78s comes with built-in worldwide basemap, so you can navigate anywhere with ease. And, like the rest of the 78-series, 78s is IPX7 waterproof and even floats in water.
Get Your Bearings

GPSMAP 78s has a built-in 3-axis tilt-compensated electronic compass, which shows your heading even when you’ re standing still, without holding it level. Its barometric altimeter tracks changes in pressure to pinpoint your precise altitude, and you can even use it to plot barometric pressure over time, which can help you keep an eye on changing weather conditions.
Share Wirelessly

With GPSMAP 78s you can share your waypoints, tracks, routes and geocaches wirelessly other compatible device users. Now you can send the location of your favorite fishing spot to a friend to find. Sharing data is easy. Just press “ send� to transfer your information to similar units.
Keep Your Fix

With its high-sensitivity, WAAS-enabled GPS receiver and HotFix™ satellite prediction, GPSMAP 78s locates your position quickly and precisely and maintains its GPS location even in heavy cover and deep canyons. The advantage is clear — whether you’ re in deep woods or just near tall buildings and trees, you can count on GPSMAP 78s to help you find your way when you need it the most.
What' s in the Box:

* GPSMAP 78s
* Wrist strap
* USB cable
* Quick start manual

Physical & Performance:
Unit dimensions, WxHxD: 2.6" x 6.0" x 1.2" ( 6.6 x 15.2 x 3.0 cm)
Display size, WxH: 1.6" x 2.2" ( 4.1 x 5.6 cm) ; 2.6" diag ( 6.6 cm)
Display resolution, WxH: 160 x 240 pixels
Display type: transflective, 65-K color TFT
Weight: 7.7 oz ( 218.3 g) with batteries
Battery: 2 AA batteries ( not included) ; NiMH or Lithium recommended
Battery life: 20 hours
Waterproof: yes ( IPX7)
Floats: yes
High-sensitivity receiver: yes
Interface: high-speed USB and NMEA 0183 compatible
Maps & Memory:
Basemap: yes
Ability to add maps: yes
Built-in memory: 1.7 GB
Accepts data cards: microSDâ„¢ card ( not included)
Waypoints/ favorites/ locations: 2000
Routes: 200
Track log: 10, 000 points, 200 saved tracks
Features:
Automatic routing ( turn by turn routing on roads) : yes ( with optional mapping for detailed roads)
Electronic compass: yes ( tilt-compensated, 3-axis)
Touchscreen: no
Barometric altimeter: yes
Camera: no
Geocaching-friendly: yes ( paperless)
Custom maps compatible: yes
Photo navigation ( navigate to geotagged photos) : yes
Outdoor GPS games: no
Hunt/ fish calendar: yes
Sun and moon information: yes
Tide tables: yes
Area calculation: yes
Custom POIs ( ability to add additional points of interest) : yes
Unit-to-unit transfer ( shares data wirelessly with similar units) : yes
Picture viewer: no
Garmin Connectâ„¢ compatible ( online community where you analyze, categorize and share data) : yes