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41207Re: [CentralTexasGeocachers] Kim Komando

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  • Victor Engel
    Feb 16, 2013
      Kim's video was also wrong in that it is not true that there are
      always at least 4 satellites in a direct line of sight. It may be true
      that there are always at least four above the horizon, but they may be
      blocked by mountains or downtown buildings.

      Last summer, I went to Guatemala and visited, among other places, a
      location for a development that my brother's architecture firm is
      working on. It's nestled in a valley. I recorded our path with my GPS
      but lost the signal completely at about 1000 yards of the building
      site. My GPS wasn't able to reacquire a signal until we had mostly
      left the valley.

      From the building site up to the mountain tops the angle of view was
      about 40 degrees except to the west where it was about 15 or 20
      degrees. I've been meaning to try to figure out how many satellites
      could have been visible, but I bet it was no more than two at the
      time. Maybe three.

      On 2/16/13, Victor Engel <brillig@...> wrote:
      > Another reason for inaccuracy was not mentioned. The military actually
      > scrambles the signal a bit to create the inaccuracy. To get full
      > accuracy you have to know how to properly decrypt the signal. That's
      > something only the military is intended to have access to.
      > It's possible to gain a higher level of accuracy by using two GPS
      > units, one at a fixed, known position. The random error can then be
      > backed out using this unit as a reference.
      > Victor
      > On 2/16/13, Dave Read <dave@...> wrote:
      >> Hey Esther!
      >> The post worked just fine -- great video.
      >> If anyone is interested, last summer I developed a hands-on method for
      >> explaining GPS to kids so my wife old teach a geocaching class at a Cub
      >> Scout camp. It's super easy, actually conveys more of the nuances of GPS
      >> (especially the source of the position inaccuracy), and best of all, is
      >> totally understandable by kids as young as 9 or 10!
      >> Thanks for the link!
      >> Dave
      >> aka Team Landshark
      >> On Feb 15, 2013, at 10:46 PM, "bigguy9211116" <bigguy9211116@...>
      >> wrote:
      >>> Howdy!
      >>> I don't normally post links and I am not very techno savvy but I do
      >>> listen
      >>> to the Digital Goddess, Kim Komando who is.
      >>> Today I ran across this;
      >>> http://www.tvkim.com/watch/2790/kim-on-komand-how-does-gps-work?utm_medium=nl&utm_source=tvkim&utm_content=2013-02-15-article-screen-shot-f
      >>> This is her explanation of how GPS works and I thought someone might
      >>> find
      >>> it helpful and decided to post it. I also hope I did it right!
      >>> Esther/BGTx
      > --
      > Victor Engel

      Victor Engel
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