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It's the elements and the signal strength that the marine variety have to deal with that make them more expensive. It's different when the unit needs to be able send a signal 50-100 miles from out in the ocean versus on land where there are more towers and whatnot. Also, the saltwater and rougher conditions (banging around) cause the manufacturer to design and protect the innards differently.
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"like strapping a pillow on a bull in a china shop" Bullitt
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