NSW and Victoria just jumped 1.8 metres north

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On New Year’s Day, NSW and Victoria jumped north by 1.8 metres – while the rest of the country remained firmly fixed in place

The change is being made to fix a 1.8 metre inaccuracy that has crept into our GPS coordinates, caused by Australia slowly drifting north.

In the days of paper maps our tectonic drift did not pose a real problem. The continent might move but the distance from Melbourne to Sydney stayed the same. That meant Australia could get away with the slight inaccuracy that has crept in since we last set our coordinates in 1994.That's because GPS satellites precisely locate you on the surface of the Earth.

Add in the inaccuracy of GPS itself – it is accurate to about five metres – and that explains why you can sometimes open Google Maps and discover yourself trapped inside a building or drowning in a lake. Official government road maps and property boundaries will now line up perfectly with GPS location data.

 

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