The LakeMaster® ProMap Iowa/Illinois product contains 36 High-Definiton maps, many with one-foot contours PLUS Great Lakes charts for Lake Michigan and Green Bay and Hundereds of enhanced lake maps with detailed shoreline, depth contours, islands, boat ramps, and more. Also contains general road and lake coverage statewide to get you to & from the lake. Product is available in Garmin® MapSource CD-ROM, pre-programmed data card, or microSD card formats.