Wondering if anyone has successfully gotten a 64gb ddxc card working in an Oregon 550t. I played around with different file types, fat, exfat, fat32, etc. No go so far. Years ago, Mine wouldn't take a 16gb card either. 8 was the magic card for my unit. Now it takes a 32gb without issue.

Had a theory though. Could we multi partition the card with 2 x ~32gb partitions in fat32? Would the unit recognize both partitions? or its it the card itself that is a no go? The 32gb card in it now is an SDXC not the older format of SDHC. In theory it should work, just not sure on Garmins file system hierarchy

Thoughts before I start the project tonight?