The Humminbird 597ci HD Combo features a high resolution 640V x 640H 5-Inch color display, Dual Beam PLUS sonar with 500 Watts RMS power output, and 50 channel internal GPS Chartplotting with built-in UniMap. The UniMap covers the contiguous U.S.A. coastline and inland lakes and rivers at 30 meters per pixel resolution. On the coast, this clearly shows features as small as canals, and many coastal navigation lights. Inland, the UniMap features virtually all recreational lakes and rivers, plus hundreds of thousands of small lakes that don’t appear on other charts. In other words, your lake is likely to be there! With the UniMap, you have a chart virtually anywhere you travel in the United States. Features include SD card slot, Freeze Frame, Real Time Sonar window, instant image update, true arch technology, selective Fish ID, echo enhancement, split screen zoom, and wide or narrow cone split screen. The user-friendly technology includes custom digital readouts, large digit view, quick disconnect mounting, triplog, and X-press menu system. The unit has a built-in GPS antenna, SD card slot for increased memory storage, and can store 2,500 waypoints, 50 routes, and up to 50 saved tracks with 20,000 trackpoints each. The package includes a transom mount transducer, installation hardware, and owner-Feets manual. Dimensions: 6.9-Inch W x 7.5-Inch H x 4.5-Inch D. One year parts and labor warranty.