The recent update to Garmin Express prompted me to connect my Nav6 and attempt the update. But, on my Windows 10 PC, I could not get Garmin Express to connect with my GPS unit. I had a 64Gb SD card in the GPS, and it had been working OK at some earlier time. But I discovered that if I removed the SD card, The GPS would immediately connect to Garmin Express on my Windows PC.
Here's what I discovered: On Windows, the largest SD card that can be formatted with FAT32 is 32 Gb. However, if you have access to a Mac, then you can connect a 64Gb SD card, and format it as "MS-DOS-FAT." And then, if you place the "MS-DOS-FAT" formatted 64Gb SD card into the Nav6, a Windows 10 PC can connect and use the larger SD card in Garmin Express or Basecamp.
Apparently, I had installed the 64 Gb card into the Nav6, and then used it on a Mac, and never tried to connect it to a PC. However, now, with the correct formatting, I can use my Nav6 while connected to either a Mac or a PC.
Of course, my extra memory is completely empty anyway. Maybe someday I will buy enough maps to require that extra space.
Cap
Here's what I discovered: On Windows, the largest SD card that can be formatted with FAT32 is 32 Gb. However, if you have access to a Mac, then you can connect a 64Gb SD card, and format it as "MS-DOS-FAT." And then, if you place the "MS-DOS-FAT" formatted 64Gb SD card into the Nav6, a Windows 10 PC can connect and use the larger SD card in Garmin Express or Basecamp.
Apparently, I had installed the 64 Gb card into the Nav6, and then used it on a Mac, and never tried to connect it to a PC. However, now, with the correct formatting, I can use my Nav6 while connected to either a Mac or a PC.
Of course, my extra memory is completely empty anyway. Maybe someday I will buy enough maps to require that extra space.
Cap