Humminbird 581i 5-Inch Waterproof Marine GPS and Chartplotter with Sounder

The Humminbird 581i Combo features an ultra-high resolution, 16 level grayscale 640V x 320H 5-Inch display, Dual Beam PLUS sonar with 250 Watts RMS power output, and 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 Freeze Frame, Real Time Sonar window, selective Fish ID, echo more »