Map Update South Florida (South of Sarasota and Sebastian) Only applicable for existing customers who are updating a chip more than year old. Covers south part of Florida including inland areas south of a line from Sebastian Inlet to N. Sarasota Bay. Coverage includes the intracoastal waterway, Lake Okeechobee and all substantive inland water features. The Everglades and 10,000 Islands are fully covered. The Florida Keys are covered approximately out to the reef line and also include, the Lakes Passage, Marquesas Keys and Tortugas National Park.