The Humminbird LakeMaster Great Lakes v4 microSD map card has added over 140 new lakes and 50 High Definition waters, and boasted contours for a total of over 1540 lakes with more than 380 lake maps in High Definition for Michigan, Indiana, and Ohio. Humminbird 600015-7 LakeMaster Chart - Great Lakes - v4 Updates: All of Lake Huron (now including Georgian Bay)Full coverage of Lake SuperiorUpdated shallow water areas for Lake Michigan and parts of Lake SuperiorBeaver Island on Lake Michigan in High DefinitionUpdated the Detroit River High Definition survey (including the Canadian side)Updated the St. Clair River High Definition survey (including the Canadian side)New High Definition Survey of Lake St Clair (including the Canadian side)High Definition survey of Lower Grand and Spring Lake in MichiganHigh Definition survey of Portage/Torch, Houghton in MichiganHigh Definition survey of Wamplers, Lenawee in MichiganHigh Definition survey of Syracuse, Kosciusko in IndianaOf course, with the LakeMaster Great Lakes v4 micro SD map card you enjoy all of the LakeMaster features including the following:i-Pilot Link compatibleEasy to read contoursDepth Highlight RangeWater Level OffsetShallow Water HighlightScrollable Lake ListNOTE: The Great Lakes product no longer includes Kentucky and Tennessee lakes. See the LakeMaster SouthEast Edition products for lakes in these states.