The Humminbird 587ci HD Combo features a brilliant, color 640V x 480H 4.5in. display. Dual Beam PLUS sonar with 2400 Watts PtP power output, 50-channel internal GPS Chartplotting with built-in UniMap cartography, a card slot for saving maps and waypoints and a Tilt & Swivel Quick Disconnect Mounting System. Memory can store 3,000 waypoints, 50 routes and 50 tracks with 20,00 points each. 50 channel GPS with trackplotting, chartplotting, GPS speed and Humminbird UniMap. Can be ordered with inside hull/transom mounting transducer or with a transducer specifically made to fit the front right scupper hole in most Ocean Kayak brand sit-on-top kayaks.