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I understand that its possible to cache Google maps for offline use.

But is it possible to search or calculate new routes with the pre-cached map without connecting to internet?

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doubt it. Most of the Maps functions depend completely on internet connectivity. –  jlehenbauer Jun 21 '12 at 19:26
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1 Answer

up vote 5 down vote accepted

This is not possible at the moment (but maybe in the near future).

Reason:
Google maps data is stored as raster image tiles without any meta information (street vectors, streetnames, interceptions and so on) besides the geolocation per tile. This means routes cannot even be calculated offline even if someone wants to.

Maps is deliberatly an online service, Google wants you to be "connected".

You have to either buy one of the many pro routing apps (from Navigon, CoPilot or others) or use one of the Open Street Map apps that also provide offline routing (I really like OsmAnd+ or OsmAnd free). See also Open Street Maps wiki for more apps and info.

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During a recent event, Google said that this functionality is coming soon: androidcommunity.com/… –  Chahk Jun 21 '12 at 20:22
    
Thanks for the information! I have updated the answer. –  ce4 Jun 21 '12 at 20:43
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