..I also find myself navigating with the satellite layer enabled from time to time, which does use quite a bit of data, and which you can't really pre-cache since the data volume is quite large (and varies depending on what zoom level you're at.)
Dedicated GPS navigation systems use "preloaded maps", and have lots of detail including 3D buildings etc.. all in just a few GB of flash for entire continents.
Same deal for "proper" GPS navigation software for Android --> the marketplace has several, including what appears to be a very good one based on TomTom maps (preloaded, of course).
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