Once upon a time a good local electronics repairman could fix your marine gear. Manuals had pages of circuit diagrams in the back of them. Of course then, TV's were black and white, and you could take the tubes out of them and test them. The trade off was the gear was very large, and was full of antique transistors, capacitors, crystals and the ilk. There are still a few of these specialized technicians around, but nowadays most marine electronics are repaired by replacing the bad board, or more often warranty repairs are done by replacing the entire unit, lock stock and barrel. The huge hole you see below had a VHF radio in it that has now joined those who are dearly departed.
