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41209Re: [CentralTexasGeocachers] Kim Komando

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  • Dave Read
    Feb 16, 2013
      This is not correct. The fuzzing you are talking about is (was) called "selective availability," and was turned off in May 2000 by executive order from Bill Clinton. This action, in fact, was the genesis of geocaching in the first place. See http://www.geocaching.com/about/history.aspx for more details.

      Basically, when people starting thinking about the implications of the change from ~100-foot accuracy to ~10-foot accuracy, somebody thought "I could make a fun game out of this!" and the first cache was published less than a month later.


      From: Victor Engel <brillig@...>
      Reply-To: <CentralTexasGeocachers@yahoogroups.com>
      Date: Saturday, February 16, 2013 7:59 AM
      To: <CentralTexasGeocachers@yahoogroups.com>
      Subject: Re: [CentralTexasGeocachers] Kim Komando


      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.


      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

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