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Oddnick,
I would first look at where you have your current transducer mounted. I am assuming it is not currently a through hull, since the consensus is they will not work due to the "air pockets" in the hull. It is important to remember how the transducer works to understand how to make it as efficient as possible.
Transducers send out a signal that is able to read changes in the density of the water. That is as basic an explanation as I can make. Air bubbles are one of the easiest changes in density for the signal to detect. Therefore any air bubbles are read immediately and are read by the unit. That is how the FF locates suspended fish, by their internal bouyancy compensator or air bladder. If the air bubbles are concentrated enough, like what you get from the transom of a boat underway, then the unit may interpret that as the bottom and hence no further reading of the actual bottom below the air bubbles. Note how the bottom will return once you stop the boat and clear the turbulence.
The transducer must be placed in a spot were the bubbles from turbulence off of the trailing edge of the transom are minimal. The type of transducer (shape), depth of placement in the water, with relationship to the lip of the transom, irregularities on the bottom of the boat, etc all add or subtract from the quality of the performance of the transducer.
Maybe some of the guys who own Garmin units could chime in to tell you where they have mounted their transducers for maximum performance. Other than that, check the bottom of your boat, particularly near the transom to see if you don't have a bump or irregularity that is causing undue turbulence right in front of your current mounting place.
Good luck. It can take several tries before you get it right.
Codfish
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