I recently purchased a Garmin 64st and downloaded a Idaho Topo Map to Garmin Base Camp and then transferred it to the GPS SD card, its a 32GB SD card that was formatted to FAT32. I am unable to view this map on the GPS. I have disabled all of the other pre-loaded maps and left this one enabled but still cannot open or view this downloaded map. Are these maps compatible with the Garmin 64st ? I am very new in regards to operating a GPS so my knowledge is very limited in that aspect. Is there something that I am missing or a set of instructions that I could follow ? Thank you in advance for the help. I appreciate it very much.