Lakemaster Chart Great Plains MicroSD/SD. The LakeMaster Advantage. The unmatched accuracy and detail of Humminbird LakeMaster give you a serious edge. Patented features include the ability to select and highlight a specific depth range, the option to shade shallow water ranging from zero to 30 feet, and the power to synchronize depth chart contours and shorelines with the current water levels of lakes, reservoirs and rivers. With these exclusive features and more, you ll have everything you need to make your time on the water more productive. Coverage and Compatibility. Humminbird LakeMaster Great Plains, Version 6 combines many of the best fishing waters for Iowa, Illinois, Kansas, Missouri and Nebraska, all on one map card. Version 6 also brings the groundbreaking technology of Follow the Contour to your fingertips. When combined with a compatible i-Pilot Link system, your map card allows your boat to automatically follow a path directly on or offset from any contour, so you ca The LakeMaster Advantage. The unmatched accuracy and detail of Humminbird LakeMaster give you a seri Coverage and Compatibility. Humminbird LakeMaster Great Plains, Version 6 combines many of the best Version 6 contains 160 new or updated lakes from the previous version, and now has over 500 total la Lake of the Ozarks, MO. Three Mile, IA Twelve Mile, IA Pleasant Creek, IA Cedar, IL