MapSource LakeMaster Michigan ProMap coverage provides superb detail for fifty of the most popular lakes in Michigan. LakeMaster ProMap charts feature 1' depth contours, developed for serious fisherman. Offering important bottom details, such as structure, contours, drop-offs, creek channels, and much more, created from on-the-water surveys. Lake detail includes islands, reefs, points, bays, access points and more. Your Garmin GPS will accurately place your boat on the map as well as show detailed tracklines and waypoints. With amazing bottom detail and one-foot contours, LakeMaster is sure to help you key in on prime fishing locations in Minnesota.