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I am making a holder to put the transducer off the front of the boat, I do not plan on using it a high speeds, how far do I need it to be away from my trolling motor to avoid electrical interference or obstruction by the trolling motor? the way it is now it will be about 14 inches to the left of the motor and about even with the prop.. or I can move it up as far as I need to, or back about 6 inches.. .also I can make adjust the depth if I know which way to go.. above, even ,below the prop..
Mine is mounted on the TM and I get no interference. So I would say whereever you want it.
How far away from the trolling motor to not get RF interference would be dictated by just how bad the RF interference is. The stronger the interference the farther away the transducer and all of its cables would have to be (this would also include the unit and any cables that run from the trolling motor near the unit, its transducer or even the power cables for the unit). I would temporarily install the transducer on the trolling motor, put the boat in the water and test it as various trolling motor speeds to see if you will even have any RF interference from the trolling motor.