The Garmin GPSMAP 79 Series Marine Handheld GPS Unit lets you stay on course and track more adventures thanks rugged, floating design and a robust feature suite. It's water-resistant, it floats, and it's fogproof, so it belongs on the water, just like you. This thing can remember up to 10,000 waypoints and more, so you don't have to remember them. It's nice to have reliable positioning when you're out on the water: The built-in compass will point you in the right direction. If rough waters come and the handheld goes overboard, don't worry. This device floats. IPX7-rated waterproof protection ensures this Garmin handheld GPS withstands submersion in up to 1m for up to 30 minutes. A high-resolution color display lets you read it easily in the sun. The glass is even scratch-resistant and fog-proof. User-replaceable AA batteries (not included) provide up to 19 hours of battery life in GPS tracking mode. With support for multiple satellite constellations such as GPS, GLONASS, Galileo, QZSS and SBAS, the GPSMAP gives you accurate, reliable tracking and positioning around the world. The 3-axis tilt-compensated electronic compass shows your heading even while the boat is standing still. More memory than previous models means you can save and track 10,000 waypoints, 250 routes, and 300 fitness activity files. Fast, reliable GPS with rugged design 3-axis tilt-compensated electronic compass Buoyant: floats IPX7 waterproof High-resolution color display Scratch-resistant, fog-proof glass Support for GPS, GLONASS, Galileo, QZSS and SBAS satellites Storage for waypoints, routes, and fitness activity files