Key features that separate BlueChart g3 from a basic preloaded basemap include Auto Guidance, which calculates a suggested route automatically based on the boat's desired draft and overhead clearance and flags shallow water or obstructions along it; Depth Range Shading across up to 10 depth bands for a fast visual read of water depth at a glance; and contour detail down to 1-foot increments for more precise fishing and shallow-water navigation. It supports both standard 2D overhead chart viewing and a 3D 'over the bow' perspective view for easier real-world orientation, and Garmin has tuned this generation for smoother transitions between zoom levels and more seamless continuity across chart boundaries than earlier BlueChart releases. Licensing is tied to one device: the chart data is unlocked for a single compatible chartplotter during the initial download/activation process, and a separate licence is required to use the same chart on a second unit.