Quote:

Doesn't anyone just stick the transducer to the outside of the hull with a suction cup?

I think there are plenty of ways to mount them BUT since you mentioned them being cumbersome mounted outside canoe, I think you answered your own question.

If you were going in and just base-camping NO portaging then whatever is the quickest/easiest is what I would go for.

The last thing you need on that 33 day trip is something snagging on portage or something you have to mount/dismount on portages.

I'd figure a way to mount it ONCE and forget it.