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Product DescriptionLakeMaster features Digital GPS Fishing Maps for your Humminbird GPS unit. High-definition accuracy and detail combined with Humminbird's ground-breaking side-imaging sonar capabilities will give anglers advantages on the water like never before.
Water Level Offset
* Synchronize the fluctuating water level to your chart. Contour numbers change automatically.
* Select and highlight a particular depth range, so you can easily target productive water and stay in the bite zone.
Shallow Water Highlight
* Shallow water is highlighted in red, making it easy to see.