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The water column is "everything within a semi-circle equal to (or less than) the water depth" ...
So in your scenario of 20ft water depth = everything that is less than 20ft from the xducer will be shown in the water column ... then use the target shadow to help your mind's eye visualize how high off the bottom that target is ...
Rickie
Last edited by rnvinc; 12-13-2016 at 05:07 PM.
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