Platinum+ Saltwater and the Great Lakes One foot contours inshore and nearshore 3 and 6 contours offshore beyond 90 Daily updates Multi-dimensional marine charts include comprehensive Nautical Chart, incredible fishing detail with SonarChart 1 ft HD bathymetry map, and Community Edits. Plus, exclusive Platinum features take the boating experience to a whole new level: 3D view, high-resolution photo/chart overlay, port photos, and geo-referenced coast pilots. Register online for one year of daily updates to Nautical Chart, SonarChart and Community Edits. Visit Navionics.com/downloads-updates to enjoy preloaded content and download the latest charts. Enhance SonarChart with sonar logs you collect using a plotter or mobile device. High-definition fishing detail, 3D View, satellite overlay, port photos, tides & currents, safety depth contours, navaids, coastal points of interest, and port services information. Check compatibility at navionics.com, which is continuously updated.