Altitude anomaly?

Discussion in 'rec.sport.unicycling' started by mgrant, Jan 28, 2006.

  1. mgrant

    mgrant Guest

    Today I went for a ride with my new Garmin Forerunner 201 GPS. I'm
    really confused by the data that I'm presented with.

    I started the GPS at my home as I began the ride and stopped it when I
    returned to the same spot. The statistics for the ride are:

    Distance: 7.89 Miles
    Climb: +589/-624

    So, Apparently during my ride my house sunk 35 feet? Is this just an
    accuracy thing or is there more to these numbers that I'm not
    considering?

    Thanks,

    -mg


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  2. giraffe

    giraffe Guest

    if the altimeter on your gps works by a barometer a sudden change in the
    weather could effect the readings like that, or if your gps's altimeter
    works off satillites then you need alot of coverage to provide accurate
    height, the weather can affect this (clouds slow the gps signal down)
    or if you where in the bush with little overhead view then it would
    explain it :rolleyes:


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  3. phil

    phil Guest

    It's an accuracy-on-startup thing. When the GPS first establishes a
    position the altitude is all over the place, generally up to around 100
    feet out. I get round it by turning the GPS on, letting it sit for a
    minute or two until it gets a decent position then resetting it, or
    when I upload the track to the computer I just delete the first few
    trackpoints with the dodgy elevation.

    Phil


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  4. Klaas Bil

    Klaas Bil Guest

    giraffe has the right explanation (IMHO). But this thread should be in
    Just Conversation (IMHO again).
     
  5. giraffe

    giraffe Guest

  6. silverfridge

    silverfridge Guest

    I think your house did sink 35 feet, but at that precise moment in time,
    a wormhole opened up, distorting time and space so your house, now, and
    forever will not be 35 feet lower, but as the lateral motion of time
    didn't alter your electronic gizmo, it displayed the correct altitude.

    :p


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