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Am I the only one who doesn't know what a "730N" is?
Is it like the "710" round **** thing on top of most engines?
It's a version of the radio. I believe that's one of the two models the RER (SAT/NAV/30GB HD) split into. One version has NAV made by the old company that did the RER radios, the other other has GARMIN for the SAT part.