I can't say I agree with that assumption. The air around the marina is much saltier than the air a few miles inland. I have seen cars rust out in a very short time when parked too close to the ocean, yet they can remain rust free for many years if kept in drier inland climates. I left my BoomBox on the boat one summer and it was shorted out from the salt air corrosion in one season. Why is it that boat parts are made from non-corroding materials like aluminum, 316 SS, wood, plastics, fiberglass etc. Marine grade radios come with superior wiring and plastc waterproof speakers. The coastal marinas are usually a corrosive salty air environment and that air easily finds its' way into your cabin. The inside of a car is not generally exposed to salty air for durations that the inside of a boat cabin is.:naughty:Getting a "Marine" radio is a good idea if you put it outside. If you put the radio in the cabin of the boat a regular automotive radio is just fine. The radio inside of the cabin is not getting exposed to anything that it doesn't get exposed to inside of a car.
As an aside I have seen the snaps and zippers on my jackets corrode in one summer left on the boat, yet they never corrode in the car or home.
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