Garmin LakeVu U.S. All Brand New Includes One Year Warranty Product # 010-C1087-00 microSD™/SD™ Card The Garmin LakeV? g3 US advanced freshwater fishing map contains detailed coverage of 17,000 lakes having up to 1 foot contours, integrated with Garmin and Navionics data. LakeV? g3 employs Auto Guidance Technology that uses the desired depth of the user and the overhead clearance to calculate a route and suggest a path to follow. The maps also feature up to 10 depth ranges, and also allows to use shading to designate the shallow water depths the user might need to avoid. Users can adjust the maps according to the lake's current water level, this gives them a better idea of spots that are either accessible or too shallow to explore. LakeV? g3 US Features Navigational Software Download Detailed Maps of US Lakes Includes More Than 17,000 Lakes w/ 1? Contours Auto Guidance Technology Uses Desired Depth Overhead Clearance to Calculate Route Suggest Path to Follow Depth Range Shading Up to 10 Depth Ranges Displays Shaded Target Depths Shallow Water Shading Allows Map Shading at User-Defined Depth Clear Display of Shallow Waters to Avoid