As far as my knowledge goes the GPS receiver is in the shark fin antenna but only CC's optioned with gps come with the shark fin antenna, those which do not have a rns510 from factory don't have a shark fin.
So if your car doesn't have a shark fin but does have gps, someone retro fitted the gps unit and they would of used a aftermarket GPS receiver which may be located in a bad spot, reducing signal strength on the Gps fix.
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