I was wondering if anyone knows how to dial in a graph.. I am new to garmin and just got the unit and transducer installed my picture looks nothing like what it does in simulation mode . I was wondering if anyone can help give me some tips or tell me some tricks to produce the best possible image as I'm not really wanting to pay someone 150 to 250 to do it for me.. I've been tinkering with the settings here and there but cant get a clear image.. any help would be greatly appreciated.