I would imagine you are using A-GPS (are you using V20??).
If you are, you can turn this setting off to use only the GPS.
A-GPS uses the internet to get the satelite location info so that your GPS locks on fasterhence the need for a network connection when using that method.
It will take a little longer to get a lock without it but as long as you are not moving and have a clear view of the sky, you should not be too bad.
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