- 1). Remove the SD card from your Garmin by pressing the card in, which will make it pop out. Pull the card from the device gently.
- 2). Insert the card into an SD reader connected to your computer.
- 3). Navigate to the "Start" menu and select "My Computer."
- 4). Double-click "Garmin C340" in the "Removable Media" section of the screen. Your computer may have named it "Garmin" or something similar.
- 5). Drag the maps from this folder onto your desktop or into a back-up folder.
- 6). Close the windows.
- 7). Remove the SD card from the SD reader according to its instructions.
- 8). Insert the SD card into your Garmin device.
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