From what I know. The black strip down the center is under the boat. Yes, tilt left to see right, etc. The images closest to you are from the black line under the boat and gets progressively further away the closer you move to the edge of the screen. Neck cramps are common from guys I have talked to learning to interpret the graph.
I am in agreement. They should have a button on the screen where you can flip the screen any direction you want. If you are scanning and looking primarily at the bank then you should be able to put that side of the boat on top and read it go horizontally. Only makes sense to me. I can flip the screen on my laptop any direction I want, why not the sidescan?
The Hound