filletfetish,
I understood your original post and will say that: Yes, if you showed a tree in the DI sonar as you passed it and rotated your trolling motor to the right slowly enough and it showed up again, that the tree was to the right of the boat. Since you have already moved past the tree it would have to be either directly behind the transducer, back to the left or back to the right of the transducer. Rotating the transducer to the right would show or eliminate one or more of these possibilities.
I like the Chinese fan analogy.
