GPSs are all wrong!

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Originally Posted by DiscoMick

....Our continent is moving north at 7cm a year (making us the fastest-moving continent - Australia leads the world again)...

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If there's an Ashes version of tectonic plate movements, then we would beat the UK at least. The Eurasian plate is only moving south at between 7 and 14mm per year. :D

Last one to the equator buys the beer!

But that poses an interesting question, all longitudes are measured from the Greenwich Meridian (or as near as dammit), so if the Greenwich Meridian is moving as well, we don't stand a chance in ever being correct.

GPS - as used by civilian navigation systems has an accuracy of ~10mtrs...

If you want better you need DGPS...

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Originally Posted by Avion8

I guess so if it thinks you are 1.5 mtrs closer to the left hand side of the road. Luckily most of our main roads here have the ribbed white line, which you can definitely hear if departing the lane, usually when those great big wide loads are coming the other way with a house, or haul pac.

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I'd be shocked if there is still a Haul Pac in operation anymore... Cat or Komatsu perhaps [emoji106]

Bit of a joke when Garmin maps show the road going into a reservoir south of Emerald when the road across the dam wall has been there for about 10-15 years or so.
In fact many of the Garmin maps of smaller roads eg the Plenty Highway, show you hundreds of metres off the road.LOL

Regards Philip A

http://mobile.abc.net.au/news/2016-0...moving/7668014
Sent from my SM-G900I using AULRO mobile app
Apparently driverless cars need accurate GPS.

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Originally Posted by PhilipA

Bit of a joke when Garmin maps show the road going into a reservoir south of Emerald when the road across the dam wall has been there for about 10-15 years or so.
In fact many of the Garmin maps of smaller roads eg the Plenty Highway, show you hundreds of metres off the road.LOL

Regards Philip A

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Last time I drove the Plenty Highway (30+ years ago) it was at least 200 metres wide and maybe 10 lanes.
Well the bulldust bits were.


Martyn

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Originally Posted by Tombie

I'd be shocked if there is still a Haul Pac in operation anymore... Cat or Komatsu perhaps [emoji106]

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There's still a few around - one is still running around a quarry not far from here. The owner keeps it on for sentimental reasons. :D. It runs its original 1710 cummins V12 - smokey old beast but refuses to go to God.

He used to run quite a few, most have gone to scrap and there's a couple more parked up near the workshop for spares.

Turns out my mum was right - what goes around comes around (eventually) :o

Technobabble warning..

The GPS wont be incorrect, GPS is just time from a known satellite point in the sky. The way the map shows and extrapolates lat and longitude would be incorrect. I would guess that when they make a map they use three known points (like surveyors use) like Far West,East,North and South then match those points on their map, and skew the tiny shift in maps so that the lat and long locations don't move.

But if were talking cool stuff, how would you go with fault creep, In San Francisco they have creeps through the middle of the town.

The Town That Creep Built – BLDGBLOG
Hayward Fault:? Residential Area North of Downtown Hayward

From my experience GPS and satellite navigation, even in the same device, uses different systems.

I'm guessing the sat nav uses GPS to pinpoint a location and then apply it to the nearest road. Where I turn off for home the two roads run alongside one another, being separated by 10 metres after a hundred metres or so (although there is a steep gully between the roads) before finally branching away.

For the first hundred metres or so it is common for the display to show the car jumping from one road to t'other as it tries to workout which road I'm on.