BlueChart is Garmin exclusive marine cartography on microSD Card. Our object-oriented marine cartography provides the detail of paper charts when viewed on our plotter line. Detail includes spot soundings, intertidal zones, wrecks, port plans, restricted areas and more. You can even view chart name, number, scale, revision date and the latest Notice to Mariners update. BlueChart offers much larger coverage areas for half the price, meaning a great value for mariners.