Navionics Exclusive HD (High-Definition) Lake Maps to 1-foot contours of over 12,000 lakes throughout the US and Canada. Provides enhanced positioning information, underwater structure and navigational aids for boaters. Compatible with Navionics NavPlanner allowing boaters to pre-plan trips on a PC. Plug-and-play cartridge is ready to use, no CDs, downloads or unlock codes required. For use with chartplotters manufactured by Eagle, Humminbird, Lowrance, Northstar and Raymarine.