HUMMINBIRD®LAKEMASTER® ENHANCED LAKE CARTOGRAPHY PACKAGE - Alabama/Florida/GeorgiaProMap hi-definition lake cartography packages specifically for Humminbird® GPS fishfinders. Synchronize the depth contours & shorelines w/actual water levels of lakes reservoirs & rivers. Select & highlight a particular depth range to easily target productive water & stay in the bite zone. Easy-to-see shading highlights shallow water areas on an adjustable range from 0-15 feet.