From the manufacturer

Garmin GPSMAP 79s - Marine Handheld With Worldwide Basemap

RUGGED HANDHELD

This handheld is water-resistant (IPX7) with a high-resolution color display you can read in the sun. The glass is even scratch-resistant and fogproof.

DESIGNED TO FLOAT

If rough waters come and the handheld goes overboard, don’t worry. This device floats.

BATTERY LIFE

User-replaceable AA batteries (not included) provide up to 19 hours of battery life in GPS tracking mode.

ACCURATE TRACKING

With support for multiple satellite constellations — such as GPS, GLONASS, Beidou, Galileo, QZSS and SBAS — you’ll get accurate, reliable tracking and positioning around the world.

INCREASED MEMORY

More memory than previous models means you can save and track 10,000 waypoints, 250 routes and 300 fitness activity files.

BUILT-IN COMPASS

The 3-axis tilt-compensated electronic compass shows your heading — even while the boat is standing still.

Cast off confidently with the GPSMAP® 79s marine GPS handheld. This rugged, floating handheld features a sunlight-readable, high-resolution color display that is fogproof and scratch-resistant. You get access to a range of satellite constellations, so you get more reliable, accurate tracking around the world. Navigate wherever your adventures take you with the worldwide basemap. With more memory than previous models, you can save and track 10,000 waypoints and 250 routes. Keep your bearings with the built-in compass.