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    Re: Accuracy of consumer-grade GPS/GLONASS nav.equipment?
    From: Sean C
    Date: 2017 Apr 4, 18:44 -0700

    I have a Magellan Explorist 200, which I used to use in a sort of treasure hunt game known as "Geocaching". I got a great deal on it at Radio Shack before they went under. It's a very simple little device with only the most rudimentary display map, but it was more than adequate for my needs. In addition to the regular GPS satellites, it uses WAAS - the "Wide Area Augmentation System". I remember seeing reported accuracy of less than 20 ft. displayed on the screen when it was recieving the WAAS signals.

    If you're not familiar with Geocaching, the idea is to find a container which is hidden somewhere in a public area, like a park. Usually, the only clues you have to go by are the reported lat./lon. and the approximate size of the container you're looking for. The containers can be as small as a shirt button and are very cleverly camouflaged, so it helps to have an accurate GPS. My Explorist always led me to within a few feet of the actual location. With a good set of signals, I would trust it almost without question. The displayed altitude was less convincing, though.

    YMMV.

    -Sean C.

       
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