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rubicon,
What echo said is dead on the money. The way the transducer is mounted on the back of the boat is very important. For it to work at speed the transducer needs to be mounted to one side or the other of the motor. It also it must be mounted with about half of the body of the transducer below the bottom of the boat. This will keep the transducer in "clean" water at all times. Check on the web site of the maker of the depth finder and see if they have instructions for mounting and operation of the unit you have.
Hope that helps
Allen
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