My provider is Vodafone in Germany. To use their "Vodafone Navigator" Application, I have to buy a special tarif option for that (80-100 $ per year, must buy for 24 month). Their navigation works only in Germany/Austria/Switzerland. If I use it for example in Holland, they charge an additonal fee.

I read about Google Maps and BB Maps an other Nav apps.
Which nav app runs locally on the bb without an external map server which transfers the requested map to my device? For every 10KB of data Vodafone really charges a lot of euros.

Who is tecnical and can give an advice?