Bob_G,
AIRMAR's P75M Single Frequency 80-130kHz CHIRP Transducer is supported for use with TZTouch3.
However, AIRMAR's M135M Single Frequency 85-135kHz CHIRP Transducer is NOT supported for use with TZTouch3 :noway
And when it comes to In-hull transducers, my experience is that they do not perform as well as the wet faced thru-hull or transom mounted transducers. You may be able to see some fish targets when using In-hull transducers, but there just isn’t the same performance level as that of wet faced thru-hull or transom mounted transducers.
Just one man's humble opinion…
- Deep Blue :wink7