I'm having real issues transferring maps to microSD cards. I've tried 2 different, brand new Sandisk Extreme 128gb cards and still have the same issues. I really want to purchase the Garmin TOPO Great Britain Pro V3 1:25000 maps as a download but can't even consider it until I get this to work. Transferring using Windows File Explorer for OSM maps is a breeze, works every time. If I try to transfer a Garmin TOPO using Express it just gets to 50% and freezes, occasionally saying 24 hours remaining! I'm practicing with the Antarctica map as it is fairly small. I can transfer it to internal memory in about 4 minutes and it works great, I just can't get it to work with Removable Storage. I've tried different PC's, with and without hubs and still the same. The cards are formatted exFAT as the TOPO I want from Garmin is 13gb and won't load on a FAT32 formatted card.
Before I start a conversation with Garmin Support can anyone else successfully use Garmin Express to transfer Garmin TOPO maps to Removable Storage?