An opinion, rather than spending that money on a the BB, why look into a stand alone GPS device. IMHO, they are much better suited for vehicle navigation and have a much better screen and voice system than an app running on the BB. And keep in mind, some map apps such as GoogleMaps, BB Maps etc, all require cell data to download and display the map.
And the best part is that a decent portable standalone GPS will actually be cheaper over the long term as opposed to an app on the BB.
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