I've never had an issue like that, but - that said - you bring to light a big concern with phone/data-based nav: if the network goes down or you lose signal - you're lost.
Many have said it before... the first company to make a GPS program for the Blackberry that uses card-based data will capture the market. (The obvious ideal - the maps. etc. are card-based along with the core POI database, augmented by a more extensive POI and traffic database available via the network).
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