This freshwater GPSMAP 535s Marine Navigator boasts the brightest, sharpest, most colorful graphics you've ever seen on a 5 inch screen. The GPSMAP 535s has a 5 VGA display; preloaded, detailed maps of U.S. inland lakes; and simple, straightforward buttons and menus. You can add the optional BlueChart g2 Vision SD card for even more enhanced features. The 535s comes preloaded with detailed maps for U.S. inland lakes, including 5300 lakes with shoreline, depth contours, navaids, and more. Over 300 of these lakes are enhanced with extra Inland Lakes Vision features. For areas outside the U.S., the 535s has a worldwide basemap with satellite images in place of more traditional maps. The SD card slot makes it easy to add additional maps without connecting to a computer. And with a simple, intuitive interface and high-speed processor, the 535s makes navigating easy. 3D mariner's eye view or fish eye view provides you with a 3-dimensional perspective of map information, both above the waterline and below it. Auto guidance technology searches through map data to suggest the best passage. The sounder version, GPSMAP 535s, comes with a powerful digital sounder (up to 1 kW) and dual beam transducer that clearly paints depth contours, fish targets and structure. It's also CANet compatible, so you can share sounder data with another chartplotter on your boat. For continuously-updated weather information, you can add the optional GXM 31 antenna to receive XM satellite weather, including NEXRAD radar, and hundreds of XM radio stations right on your navigator.