I guarantee you'll have no problem with a map over 2GB. North America 2015.10 is roughly 2.2GB, and it runs perfectly off the SD Cards in both the 200W and 255W I have here. This is because both devices support the FAT32 file system, which can accept a file of up to 4GB minus 1 byte in size. Devices older than the 200W in most cases only support FAT16, which limits the map to 2GB minus 1 byte in size.
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