I have successfully installed two maps onto my Etrex30x using basecamp. I have the option to enable/disable them but when I enable the map nothing new appears on the map. I am very new to the basecamp software but have a general understanding. What am I doing wrong here?
Sounds like the same problem that has been discussed in many other threads here. Garmin updated Basecamp/MapInstall last May, and it can no longer send third party maps to your GPS. I assumed this was just a bug, but 7 months have passed and they still have not fixed it. So it was either intentional or else Garmin just doesn't care.
See this thread for more discussion and possible solutions: https://forums.gpsfiledepot.com/index.php?topic=4539.0