When it can't find the satellites - like when it's stored buried at the back of my workshop - I think it tries to fix its position by the phone signal.

This results in it wandering about and reporting itself as moving. Which caused me a bit of a panic the first time I got an email saying it had left the geofence I had set up!

The tracks it has built whilst out on a run have been surprisingly accurate - to the extent of pinpointing its position in a layby when I stopped for a break or which side of the motorway I was travelling. It even has my ever decreasing circles trying to find the campsite in Augustusburg earlier in January.

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Simon

Brighton, UK