The figures in the top right corner, is how far it is set to scan to the side. But dont count to much on it, in real life it does not "look" as wide as that. I operate on 260-300 feet most of the time. In shallow water 10-20m it can go all the way, 360 feet.
When I search for new wrecks on unconfirmed positions, I always scan both sides at the same time, as the wreck can show up anywhere. When I find it, I set the scanner to one side only to get a closer look. The screen simply gets bigger.
I dont think you can remove all the data, so You have the scan picture only. That would be nice though.
About tips, the best to do is to play with it a lot and not to get dissapointed in the beginning, when You know how it works on your boat, got the transducer postioned right, then its really great.
Here is the unofficial Humminbird Forum:
There is a new 1197c SI now!!