DESC: If you are planning to explore the wilderness of the oceans, Garmin GPSMAP 520 GPS Receiver is just the gadget that will keep you on track. With a simple, intuitive interface, this slim GPS device makes navigating virtually effortless. The Garmin GPSMAP 520 GPS Receiver features a basemap of worldwide satellite images, which gives you a better perspective of your location. This slim GPS has an SD card slot, which lets you add detailed maps without connecting to a computer. Garmin GPSMAP 520 GPS has a 3D mariner's eye view, which provides you with a 3-dimensional perspective of information. The Garmin GPS receiver also features an auto guidance technology which searches through data and creates a rout for you to follow. This feature in the Garmin GPS receiver helps you effectively avoid obstacles.