Garmin 800 SD card maps onto 820?

Hi everyone,

Just upgraded from my older Garmin 800 to the 820. On my 800 I have the Garmin OS maps on SD card. Just wondered if it is possible to copy these onto the 820? I've tried copying what I think are the correct files but I get a message about can't unlock maps when I restart my 820. I'm guessing they are locked to my 800 or aren't compatible.

Checked on the Garmin website and it seems I can download OS maps for the UK and it looks like there is an 820 option (although they offer download or SD card????) but they want £199 for the privilege which seems crazy when I already have them on my 800. Use my Garmin for both on and off road navigation so really like to use the OS maps.

Is there anyway to do this?

Thanks,
Graham
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