You can store as many maps on the TomTom as you like till your internal memeory or SD expansion card are full.
Up to 1gb of internal storage and external storage through the use of sd card in the expansion slot.
Have a look at the following forums that will give you everything you need, including all the maps, tools and patches needed to run the software. If your not a memeber I recommend signing up. It well worth it.
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