Fish Finder Problems - Buying Used
I'm doing some research on problems that can occur as fish finders get older - where and how they fail. In particular, what do you need to look out for if you are buying a used fish finder.
I can think of things like transducer damage, screen damage, cable, buttons, etc.. What else can go wrong and is there anything you can do to identify the issues before you buy a unit from a stranger?
Would you request detailed pictures of the unit, transducer and the cables? What else can you do to minimize your chances of buying a lemon.
Thanks to all who offer advice.
Grego