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As far as I know, bmw doesn't provide retrofit for nav. Bmw sales told me the car had to be built together with the nav as it involved many different parts. It will be very expensive if the nav is added later.
I used to have a Papago. There is no comparison between them as they both fit the purpose but Papago doesn't fit the use. Nav is an integrated solution that is more responsive, accurate and reliable. The nav map are more details down to the location of traffic light posts. One thing of nav not user friendly is the input method that does not have chinese handwriting feature. Mine only supports hk map. No comment on china map but I imagine it is more or less the same.
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