My friend Paul (who doesn't have internet access) has a problem with his Hummingbird 565. If he's troling very slowly (<.5 Knots) it works fine. But, if he increases speed above that, the unit shows fish everywhere. If he stops or slows down again, no fish.
Right now the transducer is mounted on the extreme far edge of the Stbd side of the transom with the face even with the bottom of the hull.
Anybody have any ideas on what's wrong? He even bought this new unit last year figuring the old one (which did the same thing) was faulty. Apparently, not.

Any help would be appreciated.

All the best,

Gary

PS Good luck hunting to those on this site who, like me, just can't wait for NH muzzleloader to start.