Realise that this is a very late reply to this and so may no longer be of use but: Garmin added firmware support for the larger micro sdhc cards in 2007 so they can be used in the garmin range. However, there appears to be some issue around map files larger than 2gb not being supported by the mapping software, although I read somewhere that the City Navigator Europe 2009 edition did support >2gb map files. You can always use the extra space for storage of extra tracks or other files though should you need to.
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