Step one: Back up Data card. Plug the SD data card into a computer either with a reader or, depending on your computer, directly into the system. Open File Explorer(PC) or a Finder Window (Mac) and copy the information from the data card into a temporary file of your choosing in your computer.
Step two: Place data card back into the Garmin system
Step three: Run the formatting of the data card Follow the prompts on screen for the formatting of the card.
Step Four: Remove the SD card from the Garmin and replace the card into your computer.
Step five: Copy information from the temporary folder onto the SD card.
This is simply a copy and paste function or a click and drag back onto the now empty data card. The FunTreks information did not need to be formatted, just the SD card itself. Replace the card into the Garmin and you should be good to go.