The ultrabright 5" screen of the Humminbird 688ci HD XD Sonar offers excellent 640 x 480 pixel resolution that displays a depth range up to 2,500-ft., built-in Contour XD map and SwitchFire Sonar, locating and targeting fish has been made easy. Program up to 2,750 waypoints and 45 routes to keep track of productive waters. Internal precision GPS and a single SD card door for cartography and recording screen shots keep your hot spots at the ready. 500 Watts (RMS)/4,000-Watts peak-to-peak power output. LakeMaster/Navionics Gold compatible. Quick disconnect mount.