Navigation System on 2002 Mercedes-Benz ML320

My navigation system was working fine and I went on vacation and when I came back the system does not read it's location. We took out the CD and put it back in drove over 100 miles and it still does not read it's currect location so the map does not show. Could any one help me. The system is picking up a satellite number because it changes but that is about it.

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