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Sometimes the internal software can get corrupted. A master reset almost always fixes this issue.
Heres how to do it.. Start with the nuvi turned off, then touch a finger on the lower right hand corner of the touchscreen.
Keep holding your finger on the lower right hand corner and press the power button.
The device will start, keep holding your finger and release your finger when you see it asks you to reset, or clear all user data.
Tap yes, and the device will reset. Take it outside so it has a clear view to the skyline and it should regain contact with the GPS satellites in 5-10 minutes or less.
That should solve the issue. If you get stuck or run into further issues, let me know!
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Senior Technician and Network Switching Systems Operator / Maintainer.