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1) GPS MAPS: Corrupt SD Card
If your Garmin GPS unit gives an error to say that the "SD Card is corrupt"....
There could be various reasons for this, and it does not necessarily mean that there is something wrong with the T4A SD Card.
Please try the following solutions:
• Reboot your GPS unit to clear the error
• If that fails, connect your GPS unit via a USB cable to your PC – copy and paste the contents of the SD Card to your PC; then format the SD Card; then copy and paste the files from your SD card back onto your SD Card.
• If that fails, please update your Garmin via Garmin Express which keeps your device up to date from Garmin.