max size don't know.
I have a single one of Russia, Mongolia, Stans Iran and not reached 2gb yet! so I would not worry too much!
The key is to stay below the maximum number of map tiles which is 2025 per map (or was last year- I am not aware of any changes in that but things change so fast these days-)
Looking at the OSM maps, the tiles (IMHO) are not an issue but would be if you use City Nav Europe for example.
Last edited by Bertrand; 23 Jul 2012 at 11:35.
Reason: added info
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