Hi Darren, welcome to the forum.

I'd say your gps antenna has gone mate, (it's located under the rear parcel shelf).

BTW Any smb gps antenna will work, the BMW unit is approx £70, a one from ebay about £6.

What version of OS are you running?

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Sept 03, M3, Silver Grey. Retro-fits: Modded Mk4 DVD Drive, OEM Bluetooth, VR Control, Rainbow Speaker Upgrade, Sony SOT Amp, HK Sub, CCFL, Intravee II, NightMode.