GPS receiver (was Re: [ILUG-Social] POTY)

[joe at galway.net]

Actually I do believe it is better than that, I just didn't have the
figures off the top of my head... so I made a conservative guess -- I
didn't want any ILUG geeks sueing me because they wandered onto the
wrong side of the road while instrumentation driving.

EGNOS info here:
http://www.esa.int/export/esaSA/navigation.html

There should be links there to the US WAAS system.

BTW: EGNOS/WAAS relies on a geostationary satellite for diff signal.
The higher the latitude the lower this sat is on the horizon... so
you can't always rely on it, especially in mountainous/woody terrain.

On a slightly OT... I don't know if anyone has seen any of these 
predictions about the earth mag field reversal. The consequence of
this is quite dire: Not only do compasses cease to function, but the
GPS satellites are likely to be fried by radiation. I'm not sure how
we are going to navigate ... Sextants??  .. or a revival or the  LORAN
and DECCA radio beacons? Scary.
 

On Dec 10 13:42, Niall O Broin <niall at linux.ie> wrote:
>
> Subject: Re: GPS receiver (was Re: [ILUG-Social] POTY)
>
> On Tuesday 10 December 2002 13:29, joe at galway.net wrote:
> 
> >   * WAAS capability (not yet properly available in Europe -- give
> > you about 3m accuracy - Magellan Meridian series work with the
> > European WAAS test signal (EGNOS), the Garmin receivers ignore
> 
> That's cute - I didn't know that differential GPS was available in that way -
> kind of like hearing "At the signal, it will be xx.xx" and having another
> voice chime in "Oh by the way, the speaking clock is about 2 seconds off
> today". But one question - surely you can mich better than 3m accuracy with a
> differential GPS system - GPS without SA alone will give you nearly that, if
> not better.
> 
> 
> 
> Niall
> 
>