I should have mentioned I tried just fast unlocker as well without a UNL file and got the message "Can't unlock Maps"
This mapset originally came locked to a SD card and not the GPS unit, the UNL file allows the mapset to be copied to different SD cards.
FID 5125, PID 9 Rgn 1 Vend 0
Where would you like me to upload to?
Is there any way to create .gma file for GPS device and for SD card?