
Originally Posted by
Fishtaco
Press Menu twice, and use the 4 way cursor key to move over to the Setup tab. Now down to the User Mode, then Right to select advanced.
Now Scroll up or down to select the Depth Offset, (it should not be visible) and use the right and left to set your offset. You use a negative number to adjust to the depth your transducer is below the waterline.
By the way, this is also covered on page 80 of your user manual.