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Thread: GPSs are all wrong!

  1. #31
    Join Date
    Jul 2009
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    Hi, my Sygig app has 'snap to track', and will sometimes have a leader line from the arrow ( position) to where it thinks I should be on the road.
    Ozi just shows me the map is wrong.
    Cheers
    Sent from my GT-N5110 using AULRO mobile app

  2. #32
    Tombie Guest
    If your Ozi is out it's more likely poor calibration of the map than the map itself.

  3. #33
    Join Date
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    Quote Originally Posted by Tombie View Post
    If your Ozi is out it's more likely poor calibration of the map than the map itself.
    Hi,
    Ozi is generally spot on the road on most maps, so they are ok with calibration.
    I catch the odd road in the wrong place though, often not by much, but a corner has been cut or the road re-aligned.
    Cheers

  4. #34
    Join Date
    Jun 2008
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    The new Gold Coast, after ocean rises,Queensland
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    ded reckoning , map to ground , **** the gps.

  5. #35
    Join Date
    Apr 2016
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    Melbourne
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    Quote Originally Posted by austastar View Post
    Hi,
    Ozi is generally spot on the road on most maps, so they are ok with calibration.
    I catch the odd road in the wrong place though, often not by much, but a corner has been cut or the road re-aligned.
    Cheers
    I've had to recalibrate many hundreds of Vic 25K topos manually .. took forever to do, over the course of a few months.
    And you're right on about some of the realigned roads .. depending on the dates of the maps, many roads/tracks and obstructions change over the years.
    You can update that info using the desktop version of Ozi too.

    Quote Originally Posted by ramblingboy42 View Post
    ded reckoning , map to ground , **** the gps.
    This is how they got the Vic-SA border so wrong! .. to the benefit of western Victorians of course
    That's why there's a misalignment of the SA border with Vic compared to the border line north of the Murray River in NSW.
    I think the land lost in SA amounts to about 1/2 million sq miles or something.

    .. good ol dead reckoning ... it made Victoria 'The Place to be'(or so say the number plates!)

  6. #36
    Join Date
    Nov 2010
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    Adelaide
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    The first GPS course I attended, run by the army for the fire service, was quite interesting. It was GPS, not SatNav, back then if there were any maps on a GPS they were quite crude and navigation was plotted using waypoints...

    The instructor, a major from the artillery, said they have found there are a lot of errors in paper maps that didn't realise until the army started playing with GPS. It would appear that as a target get further and further from your location, the map based calculations don't line up with the GPS based calculations. For example, the bearing and distance to a target reads differently from paper when compared to the GPS. The further away, the more likely a bigger error occurs.

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