This easy-to-use handheld is the perfect navigational solution for boats, sailboats or small watercraft that do not have a chartplotter. it's also ideal as an important emergency navigation backup for all vessels. It's high-sensitivity GPS marks and stores 1,000 waypoints and 100 tracks so you can navigate right back to them. Use on land or water - it floats! Features SailAssist, including virtual starting line, heading line, countdown timers and tack assist. High-sensitivity GPS receiverMarks and stores 1,000 waypoints and 100 tracksMarks your favorite locations to easily navigate back to themGarmin SailAssist™ for GPS 73 includes virtual starting line, heading line, countdown timers and tack assistSunrise/sunset, estimated time of arrival, other calculations and marine dataBuilt-in backlight