FYI for Garmin users, this is pretty cool.
Garmin announced significant coverage and detail improvements of the high-resolution relief shading coverage and detail offered in its exclusive BlueChart g3 Vision and LakeVü g3 Ultra cartography products for coastal and inland fishing and boating. Now available with coverage for the entire continental U.S. coast line and more than 150 lakes, Garmin’s high-resolution relief shading combines color and shadow to bring an entirely new level of detail to the ocean floor and lake bottom. Garmin will display its latest relief shading data in booths #326/355 at the Fort Lauderdale International Boat Show, Oct. 30 to Nov. 3.
Here are a few pics of what it looks like and the coverage areas.