Garmin Tactix GPS Navigator High-sensitivity GPS positioning with automatic calibrating altimeter, barometer and 3-axis compass All metal surfaces PVD-coated in black to be non-reflective - Rugged, durable, and waterproof up to 50 meters Negative mode liquid crystal display with green LE D backlight for night vision compatibility Scratch-resistant, curved mineral glass lens and rugged forged stainless steel rear case Rechargeable lithium-ion battery with up to 50 hours in GPS mode, 3 weeks in sensor mode, and 5 weeks in watch mode - Preloaded with Jumpmaster software for skydivers, Tide data (for the U.S. only), and worldwide basemap