The bright HD screen on the Humminbird 859ci HD XD GPS/Sonar Combo provides clear readouts even in strong sunlight. The 16:9 wide format allows for split screen functions when fishing vertical presentations. This SwitchFire Sonar can reach depths of up to 3,000'. It also features 480 x 800 color, making it easy to see and view fish on the 7" LCD. This Humminbird GPS, 7" is also fully GPS compatible. This HD GPS comes with Dual Beam Plus (200kHz/83kHz/50kHz) and GPS speed notifiers so that you can keep a handle on things as you go. It is also compatible with AIS and NMEA 2000.