My unit is Humminbird 798cx si combo serial # 9022502-0140
Other numbers 407440-1M and N2170
My boat is a Bayliner cruise…32 foot motor yacht series.
The 3288 has inboards, and drive tunnels with the props near the transom. The rudders are outboard of the transom and the four trim tabs pretty much cover the transom side to side.
To get a clear sonar shot side to side as well as down the transducer would have to be outboard of the trim tabs. The only way to do this is to mount a plate on the tab and install the transducer on this plate.
Of course this is not ideal.
Will being behind the props and well into the prop wash be a problem at low speeds? (I suspect it will probably be a problem at higher speeds but this is not really an issue).
I there is a shadow area (25 degrees) on the side scan from the horizontal plan so could you shoot through the hull by mounting the transducer in a water or oil bath on the bottom of the hull between the engines and behind the keel?