I have read the other post about the HDS units and how to set the transducer. My problem is I can only get a good sonar pic when I go to the 200 setting. On 83 I get junk. I am mainly fishing in water from 4-30 feet. Can you guys tell me what settings you are using to get the best pic on the 83 transducer setting? THANKS! And by the way the SI part of it is awesome!!!!