Well, I think you need a C-Map c-card <as opposed to an SD-card> which covers regions.C-Maps - MAX Lakes - NA-M018C-CARD Region 2: East covers lakes in Maine, New Hampshire, Vermont, Massachusetts, Rhode Island, New York, Connecticut, Pennsylvania, Maryland, New Jersey, Delaware, Ohio, Virginia, West Virginia, Kentucky, Tennessee and North Carolina as well as rivers in these states. It looks like it covers the Tennessee river from Paduca, KY to Knoxville.
Then you have the Region 3: South card, NA-M019C-CARD, that covers lakes in South Carolina, Georgia, Florida, Alabama, Mississippi, Louisiana, Texas, New Mexico, Oklahoma, Kansas, Colorado, Nebraska, Missouri and Arkansas as well as rivers in these states. Covering the mighty Tennessee river from Pickwick Dam to Knoxville.
These are $125 a piece.