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Thread: GPSs are all wrong!

  1. #1
    DiscoMick Guest

    GPSs are all wrong!

    Yep, our GPS coordinates are out by up to 1.5 metres, but it's not the GPS unit's fault - its Australia's.
    Our continent is moving north at 7cm a year (making us the fastest-moving continent - Australia leads the world again) and our longitude and latitude haven't been updated for a while, so our GPS units are out by 1.5 metres.
    Australia's latitude and longitude coordinates out by more than 1.5 metres, scientists say - ABC News (Australian Broadcasting Corporation)
    So, next time your GPS gives you a bum steer, you know why.

  2. #2
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    I suppose that could be a problem if you use GPS to locate the position of a sewer pipe before doing some excavation.:-)

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    Well, I wanted a holiday up near the equator, so if I wait another 435000 years or so, I can float there without having to pay. Woohoo! Cheap holiday!

    Saying that, there is a flaw in the plan, I just can't quite put my finger on it.

  4. #4
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    No wonder i couldnt find my driveway. I kept running over the neighbours letterbox instead. Bloody gps 😆😆

    Cheers Rod

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  5. #5
    DiscoMick Guest
    Yes, situations like finding sewers could be a problem.
    Amusingly, we discovered the local council has absolutely no records of the septic system at our house at Maleny when we bought it, no idea at all.
    I wonder if this affects plans of property boundaries. Our neighbor in Brisbane discovered the local council plans were wrong and his sewer line was actually on his neighbour's property, not his. That meant he had to change his house renovation and extension plans and put the new main bedroom at the rear rather than the front of the property, because he couldn't build over the sewer line where it came onto his property from his neighbour's.
    So it can be a big deal.
    I wonder what other problems this has caused. For example, does this mean that aircraft GPS system are wrong?

  6. #6
    JDNSW's Avatar
    JDNSW is offline RoverLord Silver Subscriber
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    Quote Originally Posted by DiscoMick View Post
    Yes, situations like finding sewers could be a problem.
    Amusingly, we discovered the local council has absolutely no records of the septic system at our house at Maleny when we bought it, no idea at all.
    I wonder if this affects plans of property boundaries. Our neighbor in Brisbane discovered the local council plans were wrong and his sewer line was actually on his neighbour's property, not his. That meant he had to change his house renovation and extension plans and put the new main bedroom at the rear rather than the front of the property, because he couldn't build over the sewer line where it came onto his property from his neighbour's.
    So it can be a big deal.
    I wonder what other problems this has caused. For example, does this mean that aircraft GPS system are wrong?
    While it is interesting that the discrepancy is that large, it should be pointed out that very few maps even pretend to be that accurate - and cadastral (i.e. property boundaries) are defined relative to the trigonometrical grid, so that any competent surveyor would tie his GPS position to a permanent survey mark nearby.

    The position of the sewer pipe will have had nothing to do with GPS - it probably was not installed using GPS or any other form of surveying!

    As for aviation - enroute separation is measured in nautical miles, not metres, and even in a precision approach and landing, a landing would be considered 'perfect' if the nosewheel ws that close to the centreline!

    As for services maps - several years ago I 'dialed before I dug', when I was rebuilding a fence I knew crossed the phone line. The map I was supplied showed the phone line position around a kilometre from its actual location!

    John
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  7. #7
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    That explains why my Garmin LMT lane departure warning was continually going off, so much so that I have deactivated it.

  8. #8
    JDNSW's Avatar
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    Simply means the map is inaccurate - and the movement of Australia is a very minor inaccuracy compared to other errors!

    John
    John

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  9. #9
    DiscoMick Guest
    Quote Originally Posted by Avion8 View Post
    That explains why my Garmin LMT lane departure warning was continually going off, so much so that I have deactivated it.
    That's interesting. If the GPS location was 1.5 metres off, could that cause a lane departure warning to go off?

  10. #10
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    Quote Originally Posted by DiscoMick View Post
    That's interesting. If the GPS location was 1.5 metres off, could that cause a lane departure warning to go off?
    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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