I believe the reason for the OP's question is due to his trolling mtr transducer being better than his thru hull.. so he's running around the lake with his big motor and standing up front and trying to steer the boat with the trolling mtr while viewing the screen.
KIDS don't do this at home !!!
Big motor pushing with TM down. Open water on St Clair. I get a better sonar image from the TM than I do from my shoot thru. Just curious how fast is “safe” to cover water while scouting.