Navionics Platinum+ Marine Chart for Maine on Micro SD. Comes preloaded with Nautical Chart and SonarChart, and community edits are available to download. Can be used to enhance SonarChart with sonar logs you collect. Features 1' contours inshore and nearshore, and 3' & 6' contours offshore beyond 90'. Includes tides & currents, safety depth contours, navaids, coastal points of interest, and port services information. All the same marine features in Navionics+ are augmented with 3D View, satellite overlay and panoramic photos. These additional viewing options can be used on a growing number of GPS plotters. Daily updates and advanced features are included for one year. Advanced features include SonarChart Live, Advanced Map Options and Plotter Sync. USB reader included.