With various new device software updates on their way, it appears that all new updates require certain stept to guarantee the device -> BaseCamp compatibility in the future.

Here is how it works:

IMPORTANT STEPS FOR FUTURE COMPATIBILITY WITH BASECAMP
If you are now (or future) user of BaseCamp (which replaces Mapsource in the long run) you must follow these steps to ensure your data is protected during a software update:

- connect your handheld unit to a computer and launch BaseCamp. Transfer all your tracklogs, POI's and routes into BaseCamp
- delete the /Garmin/GPX folder from the handheld's mass storage
- update the handheld software via WebUpdater and reboot your unit
- reconnect the handheld to your computer and transfer your data from BaseCamp back to your unit.