Re: Questions about EGNOS.

From: Nick Hopton (hopton_at_dsl.pipex.com)
Date: 12/03/04 

Date: Fri, 3 Dec 2004 17:08:33 +0000

In a recent message <01c4d87a$05a3d810$7551b80a@david-lee>, David Lee
<davidlee_malvern@dont.use.this.bit.hotmail.com.invalid> wrote.

[...]
>I can't remember the
>WAAS/EGNOS time-out period on a Garmin but I'm sure that it's way over
>conservative and no more than a couple of minutes at most, so even when
>it's fully operational EGNOS/Garmin for UK terrestrial navigation will
>really just be a waste of money unless you can stick to south facing
>slopes! :-(
[...]

I think that might be pitching it a bit strong, David. I don't know if
this will work with your Garmin, but after I do a factory reset on my
Geko 301 and then turn on WAAS it often shows very strong signals from
#33, #35 and #39. It even tries to use the data from these satellites
for correction purposes and the 'D's start to appear. But as you say,
this goes away after a few minutes. But I think it's more than possible
that one day we will get usable signals from EGNOS, even if we're not on
south-facing slopes. My location incidentally is Reading, in the south
of England.

Just now it's not the accuracy of the GPS which is bothering me, it's
the accuracy of the OS-maps. I've just plotted the track of a walk that
I did earlier today and it says that I walked about ten miles down the
middle of the Kennet and Avon canal <g>. This isn't the first time,
either.

Regards,
Nick. 

-- 
Nick Hopton and Anne Hopton
Caversham, Reading, England
<hopton@dsl.pipex.com>