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What's more accurate?

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The mph on the sat nav or the speedo ?



On a flat, straight road under a clear sky with three or more satellites visible, the sat-nav will be 100 per cent accurate. But on hills, twisty roads, in towns with tall buildings or in tunnels, it will simply guesstimate your speed. All car speedometers over-read by a small margin.

Edited by MrSmith
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