Many thanks for your informative post. It does seem then that the GPS is not working.
From what you say there should be a figure of 1 to 8 in the
'Received position Satellites - x ' field and also valid latitude and longitude parameters.
Once the car is moving the sat nav tries to follow roads shown on the erroneous 'current location', but gets completely confused as we keep moving, even showing the wrong compass position and eventually when we are actually going north, it seems to think that we are going south from Canterbury and after some 30 miles heads out over the English channel - just the blue of an expanse of water.
So the question is which part of the GPS system is faulty and is it worth fixing.
I find using an iPhone is possibly better than the 10 year old MMM2 system anyhow.
The system went faulty on a very cold wet evening when going to pick up an eBay item we purchased.
I have previously noticed sometimes there are signs of water having dripped from the rear headlining onto the XC60 'boot cover' and sure enough there were signs of water ingress again dripping down, when investigating the sat nav problem.
So possibly there is a water corroded sat nav connector behind the headlining, which will be a real pain to investigate.
Plan A is to leave the sat nav off and use the iPhone...... hoping that the sat nav will suddenly start working again in the sunny weather.
Plan B is a part exchange for an XC40, but second hand prices of petrol versions are holding up too well just now.
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