I concur with Steve, less turbulence equals better results. Don't get too close to or stay in front of hull steps, water intakes, rudder, prop, tracking fins, etc and you'll get good readings. You want to make sure it's in a location always in contact with water. Bubbles in the epoxy will screw up the readings. Mix it slow and press and twist slowly to seat and you'll be good. On my DD i put it just behind and to the left of the trans and have had no issues at all.
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