What is the model no. of your gamin gps unit?
What was the last you did with your gps device? did you do some updates or changed memory card?
You can try this step that I found. If you tried loading other mapas try this.
You will need to erase a file from the units memory. Connect your GPS system to your computer; go to start then ‘My Computer’, and double click on your device file (mass storage system), there you will see a folder named ‘Garmin’.
In this folder are several different files, look for file named gmapsupp.img. Right hand click on this file and delete as this file is causing the maps to lock.
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It is a Garmin Nuvi 750
The GPS is a Garmin Nuvi 750.
It either says Can't Unlock maps or no data available.
It worked fine two days ago.
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