Ron Baldanado did some research and found out why Garmin handhelds won't load maps from Basecamp on to the larger SD cards:
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I installed a Sandisk microSDXC 64GB Ultra into my unit. It was recognized by the SW on my computer, and I could load Topo 24K maps (using MapInstall) and upload custom maps to the SD card. I found however that the GPSMAP 64st could not access anything that was loaded onto the 64GiB SD card. I contacted Garmin support, and they told me that the outdoor handhelds have problems with ExFat-formatted SD cards. The SD industry has adopted ExFat for cards larger then 32GiB, so 64GiB cards are formatted using ExFat and cannot be used reliably by a Garmin GPSMAP 64st. After a quick trip to Staples to get a 32GiB microSD (which is formatted as FAT32), I soon had maps installed onto the 32GiB card and most importantly accessible by the 64st.
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I followed this link to solve my formatting problem.
https://www.youtube.com/watch?v=YcOkHajz3ug
Ride with the wind and keep the rubber side down, the Webmaster.