I don't know but I do know it is within the range where Airmar recommends not using the wedge if you have one with your transducer. Generally you should run a straight edge along the bottom of the boat. The leading edge of the transducer should be 1/8" inch or so under that line, the trailing edge should be maybe another 1/8" below that so around 1/4" at the rear. Has always worked for me on various boats and this is what the installation instructions will say or close to it.
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