GPS giving wrong position

[Robin2]

This evening I was driving home to Swansea from Peterborough. TomTom behaved impeccably for the first 130 miles, but somewhere near Evesham it showed me driving through fields. I disregarded it at that stage, because I have had it happen on that road before. It snapped back, but after about 40 miles, on the A40 before Abergavenny it started showing my position as about 50 to 100 yards to the road I was on. It kept showing my speed correctly. I tried hard resets to no avail, then I switched to C followof the road changed, my track also changed to follow it, but always 50 to 100 yards to the right.
When I got into Swansea it went berserk, because its indicated position to the right of true usually coincided with an actual road, so I got a lot of "Make a U turn" from CoPilot as it tried to get me back on the right road.
Clearly the fault is not with TomTom or CoPilot, as they both showed the same error. Does anyone have any idea what it could be? I could always do a hard reset and use Sprite backup to get it all back to where it was a couple of days ago. The only changes I have made since I last used it was to install all the speed identified cameras from the Pockey GPS World database, and install the appropriate voice files to match the speeds.
If I do a hard reset I will lose all that work and go back to my bing bong warnings with no speed indication
Robin

[Robin2]

Sorry, line 6 above should read "....50 to 100 yards to the right of the road I was on......"
Robin

[Robin2]

My PC keeps missing blocks of text. Here is what it should have said



This evening I was driving home to Swansea from Peterborough. TomTom behaved impeccably for the first 130 miles, but somewhere near Evesham it showed me driving through fields. I disregarded it at that stage, because I have had it happen on that road before. It snapped back, but after about 40 miles, on the A40 before Abergavenny it started showing my position as about 50 to 100 yards to the right of the the road I was on. It kept showing my speed correctly. I tried hard resets to no avail, then I switched to CoPilot, but that also showed me 50 to 100 yards to the right of my true position. Somet.mes I could see the road I was actually following on the far left of the screen. When the direction of the road changed, my track also changed to follow it, but always 50 to 100 yards to the right.
When I got into Swansea it went berserk, because its indicated position to the right of true usually coincided with an actual road, so I got a lot of "Make a U turn" from CoPilot as it tried to get me back on the right road.
Clearly the fault is not with TomTom or CoPilot, as they both showed the same error. Does anyone have any idea what it could be? I could always do a hard reset and use Sprite backup to get it all back to where it was a couple of days ago. The only changes I have made since I last used it was to install all the speed identified cameras from the Pockey GPS World database, and install the appropriate voice files to match the speeds.
If I do a hard reset I will lose all that work and go back to my bing bong warnings with no speed indication
Robin

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