Depends on where you sail. In NE with rocks come up fast from deep water, no way will a depth sounder keep you off the rock. Off the Gulf Coast where the bottom depths change in a very predictable and charted fashion, absolutely. One can follow the depth contours and know where they are in relation to the shore with a great deal of certainty.It is hard for me to understand how a transducer / depth sounder can be relied on in a boat that heels.
A prudent skipper would assign:
Piloting 99%
Depth gauge 1 %
IMHO.
Now a fish finder, that is another story.
Dick
As far as heeling, as long as I keep the sounder in the water all works great. Occasionally I'll see it stop reading from what appears to be very turbulent water and it's associated bubbles.