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Speed variation on SatNav


Anton

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I have a small TomTom Start SatNav mounted in a head-up display position and usually use it's speed display rather than my speedo.

Recently I've noticed sudden variations in speed displayed although I am cruising at a steady speed.

For example showing a steady 40 mph, suddenly jumping up to 48 say before dropping back to 40.

Anybody any idea if this means the SatNav is faulty or is it something to do with satelite signals being interfered with by things like trees or buildings?
 

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Jonathan - it's a Start 52 serial XR, so it's not one of those listed, a couple of years old and a present from one of my sons.

RJ I hope the GPS ISN'T on its way out.......

I'll have a go at their Forum - to see if I can avoid the factory restart and re-insertion of loads of data, or if/how to save them to an external store and then recover them

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