Easy-to-use handheld navigator with high-sensitivity GPS, marks and stores 1,000 waypoints and 100 tracks so you can navigate back to them. GPS 73 has SailAssist™, including virtual starting line, heading line, countdown timers and tack assist. This is the perfect navigational solution for boats, sailboats or small watercraft that don’t have a chartplotter or as an important emergency navigation backup for all vessels. It even floats! Provides sunrise/sunset, estimated time of arrival, other calculations and marine data. Screen features a built-in backlight making its high-contrast display easy to read in all lighting conditions. NMEA 0183 support. Up to 18-hour battery life with 2 AA batteries (sold separately).