If your depth is off because of where your transducer is located, calibration can be done through the menu by adding or subtracting a foot or two. In your never to be read manual are all the instructions necessary. If you are off by more than a foot or 2, chances are your transducer is bad.
http://www.humminbird.com/support/ProductManuals.aspx should allow you to download the manual for free and even step you through some troubleshooting.
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