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The Garmin GPSMAP 79s is a rugged marine-grade handheld GPS built for serious water navigation. Its IPX7 water-resistant housing floats if dropped overboard, while the transflective 3-inch colour display remains readable in bright sunlight and resists fogging. The device supports multiple satellite constellations—GPS, GLONASS, Beidou, Galileo, QZSS, and SBAS—for precise positioning worldwide. Store up to 10,000 waypoints, 250 routes, and 300 activity files across 8GB of memory. The integrated 3-axis tilt-compensated compass provides reliable heading data even when stationary. User-replaceable AA batteries deliver up to 19 hours of GPS tracking, whilst the scratch-resistant glass and rugged construction ensure durability in demanding maritime conditions. Pair with optional BlueChart g3 charts for enhanced navigation capability.