Thank you for your question.
Go to the Garmon.com website. Check for an "update for your Garmin Nuvi 660 GPS Receiver. Download the update which may take a while. It's best to start downloading and go do something else for a while until the download is complete.
If this doesn't work, contact support at Garmin.
Go to the Garmin website now (click here)If your unit was around $100 or so, it's easier to just buy a new one then to send yours in for service.
I found a discounted unit online:
Discounted Garmin GPSHope this helps you solve your GPS problem.
Rob913
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