An easy-to-use handheld GPS receiver for runabouts, sailboats or other small watercraft without a chartplotter. GPS 73 is also a great emergency navigation backup for all vessels. It has an intuitive user interface with dedicated backlit buttons for easy operation, with a high-contrast display that's easy to read in all lighting conditions. It features SailAssist, including useful sailing functions like virtual starting line, heading line, countdown timers and tack assist. GPS 73 is NMEA 0183 compatible. To transfer data to your device, it easily connects to your computer via USB cable or sends speed and position data to devices such as a chartplotter, computer, autopilot or radar, using the Power/Data Cable (sold separately). GPS 73's high-sensitivity GPS receiver quickly locks onto GPS signals and tracks your location even in challenging locations, such as deep canyons or under heavy tree cover. Mark important waypoints like a hot fishing spot or a lobster pot. You can mark and store your favorite locations (1,000 waypoints and 100 tracks) and easily navigate back to them. SailAssist helps you sail more effectively with heading line and tack assist. Tack assist lets you know when to tack based on whether your boat is getting headed or lifted compared to the boat's optimal tacking angle. For those who like to race, there's virtual starting line and countdown timer to make sure you cross the starting line at the right time. Use on land or water - it floats!