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The Navionics+ Regions Micro SD Card works with your fish finder to give you up-to-date marine and lake charts. This Navionics SD card gives you detailed charts of 7,500+ lakes in Iowa, Michigan, Minnesota, North Dakota, South Dakota, and Wisconsin. Plus, this SD card has all of Lake of the Woods, Rainy River, and the US waters of the region's Great Lakes. You'll be able to navigate accurately and efficiently with depth information and detailed shorelines with marinas, docks, and boat ramp locations. You will even increase your awareness of hazards and shallow waters. Plus, millions of Navionics Boating app users add valuable local information every day. Fish and boat with more efficiency, accuracy, and safety than ever before with the Navionics+ Regions Micro SD Card.