The Garmin nuvi 2555LT Waterproof Marine GPS and Chartplotter is a high-sensitivity GPS receiver boasting a 2.6-inch LCD color display for crisp color mapping. It features built-in Bluechart G2 coastal charts with a worldwide basemap along with precise imagery navigation. The waterproof Garmin handheld GPS has a three-axis tilt-compensated electronic compass, which shows accurate direction and a barometric altimeter that tracks the change in pressure and also weather variations. The GPS with barometric altimeter is extremely durable in design with molded rubber side grips. Share information wirelessly by transferring waypoints, tracks, and geocache with other compatible users. You can also load additional maps into this electronic GPS compass through the microSD card slot.