1xxx, 2xxx, 3xxx can use at least 64GiB microSDXC reformatted to FAT32. 64GiB is the largest i've tried so far but i'm sure larger will work ok in them too. I don't think the problem is in the actual size of the card, but in the sheer number of maps and map tiles that a large card could physically hold. It would easily exceed the unit's capabilities to read them. I've yet to try a really large card in an older Nuvi, like 2xx etc.
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