So when I bought my boat the seller said "radar used to work, doesn't work now, I don't know why". It's an old boat, probably an old unit, and I frankly wasn't going to base my buying decision on the radar. Last summer I had a 20 something kid out one day who spent an hour reading the manual and playing with the unit. He finally gave up saying all he could come up with is some "bad cable" error notice. Could it be that simple? A cable or connection? I'm not desperate to have radar but it would certainly be nice if it's an easy fix. Who do I call to look at this for me?