Hi Dave
That is what the ADR say yes, but I have also been told by a blue slip examiner about the issue of the speedos being required to over read.
More than that, you only have to drive on the road and see the error on the speedo and the speed indicated on the GPS*. Then travel at the posted limit by your speedo (MY12 D4) and the velocity of the vehicles around you. More often than not you will find the majority of vehicles travelling close to what your speedo is indicating as the speed limit (and about 5kph below the GPS)
Does this not tell you something about the calibration of vehicle speedos by the manufacturers?
* When I go through the speedo test points on Victorian roads my GPS is almost invariably the same as what my speed is shown on the sign.



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