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In Eurpoe our SBAS is called EGNOS, in the USA it is WAAS. From
Wikipedia "Similar to WAAS, EGNOS is mostly designed for aviation
users who enjoy unperturbed reception of direct signals from
geostationary satellites up to very high latitudes. The use of EGNOS
on the ground, especially in urban areas, is limited due to relatively
low elevation of geostationary satellites: about 30° above horizon in
central Europe and much less in the North of Europe." So typically we
don't get a good EGNOS signal in the North Sea. What with the
elevation and those bumpy things in the water. Maybe I should put the
GPS antenna up higher.

Come to think of it what do people do for Celnav on a heaving deck I
admit I have only tried it in fairly calm conditions sitting eg on the
coachroof - I suppose that is not very realistic practice! Does anyone
stand up with one arm crocked around the mast to get a better view of
the horizon?

Bill

On 5 April 2017 at 22:18, David Pike  wrote:
> John Howard you wrote : I do not think WAAS is full time for everywhere.
>
> There are various systems world wide.  WAAS is the US one.  Together they
> cover quite a bit of the Earth.  It's all explained rather well here
> http://www.sxbluegps.com/technology/sbas-made-easy/ with a rather nice
> coverage chart towards the bottom and a little bit about lower spec
> receivers at the very bottom.  DaveP
>
> 



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

   

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