I had a TomTom app used with my iPhone and later retrofitted the RNS 510. From my experience, I would say, you cannot compare RNS 510 with any portable Nav systems.
RNS 510 is a fully integrated system that is connected to the CANBUS, which communicates with the rear wheels/ABS system for accurate speed measurement, displays the 'next turn/direction', compass, street names in the full MFD in the console, voice controlled etc. Also it has a 20GB HDD (30 GB total) for storing music, plays DVD video etc.
If you want a cheaper option, (as I did) you may buy it from UK/Europe and get it fitted by a VW service centre.
RNS 510 is a fully integrated system that is connected to the CANBUS, which communicates with the rear wheels/ABS system for accurate speed measurement, displays the 'next turn/direction', compass, street names in the full MFD in the console, voice controlled etc. Also it has a 20GB HDD (30 GB total) for storing music, plays DVD video etc.
If you want a cheaper option, (as I did) you may buy it from UK/Europe and get it fitted by a VW service centre.
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