THE NAVIONICS SUBSCRIPTION: A one-year subscription to Daily Updates and advanced features is included when you purchase any Navionics+ mapping solution. After a year, you can renew at a discounted price.CHARTS AND UPDATES:Nautical Chart - Comprehensive charts are derived from multiple official, government and private sources, displayed in a familiar look and feel.SonarChart HD Bathymetry - Innovative 1' (0.5 m) bathymetry charts are created by using Navionics proprietary systems that augment existing content with sonar data contributed by the boating community.Community Edits - Get useful local knowledge from edits made by users of the Navionics Boating app on your compatible smart device.Daily Updates - Up to 5,000 daily updates to our charts give you the most accurate, most current data availableInland Content: 42,000+ lakes (varies by coverage area)ADVANCED FEATURES:Dock-to-dock Route Guidance - Start your trip with a suggested dock-to-dock route.Advanced Map Options - Customize your view to focus on the details that matter most.Plotter Sync - Transfer routes and markers, update chart layers and more - between your compatible chartplotter and the Boating app.SonarChart Live Mapping Feature - Watch new HD depth maps develop in real time as your boat moves through the water. Visit Navionics website for full feature list, coverage details and compatibility of Navionics+ content and features with your GPS chartplotter. **NOT COMPATIBLE with GARMIN GPS chartplotters**