I have my transducer mounted on my trolling motor in the front of the boat. Let's say I am moving along at 1 to 2 mph, and an object appears on the screen (perhaps a stump). OR I see some fish suspended at 6'.

How do I know where that stump is on the bottom? Can I assume that once I see it on the screen the stump is immediately in front (say 5-10 feet) of the boat, thus I should stop to fish?

Can someone explain how they actually locate a point on the bottom?

I usually fish oxbow lakes and farm reservoirs, rarely over 15 feet deep.

Thanks for any advice