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My understanding is SBAS/WAAS is for aircraft primarily which is why
it does not work so well at sea level. Also one suspects GPS is
optimized for the US  and GLONASS for Russia... is that right you
would think the military would optimise for where they expect to
fight.

Bill

On 5 April 2017 at 03:03, Sean C  wrote:
> 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.
>
> 



--
Professor of Applied Mathematics
http://www.maths.manchester.ac.uk/bl

   

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