[OSM-newbies] Detect WAAS/EGNOS mode

[Andy Robinson (blackadder)]

ael wrote:
>Sent: 25 April 2008 12:53 PM
>To: newbies at openstreetmap.org
>Subject: Re: [OSM-newbies] Detect WAAS/EGNOS mode
>
>I am a bit rusty on WAAS, but surely a major point has been missed so
>far? The corrections are made with one (or a very few) ground stations
>sampling the ionsphere disturbances on the path between those points and
>the satellites. If your unit is "seeing" a different part of the
>ionsphere, then the corrections maybe be wrong for your path. So it
>depends on how uniform the ionsphere is at a particular time. And how
>close you are to a ground station.
>
>I may be wrong about this...

As far as I know you are absolutely right. So for instance you might in
theory pick up signals from one of the WASS satellites on the west side of
Europe, however they would of little use because the correction basis is all
calculated for the base stations scattered around North America.

So for someone in Korea the same may apply if there are no base stations and
designed service covering that country.

Cheers

Andy

>
>ael
>
>
>
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