Hi All,
Just a note to let everyone in Europe know that the European WAAS System
(Called EGNOS) is also up and running and is providing excellent
corrections. It's still in the test phase as well. Check out
http://www.esa.int/EGNOS/
For another excellent GPS logging program that works well with MapInfo on
Windows 9x or CE devices see http://www.farmworks.com/products/sitemate/ or
give me a call.
Jim
Jim Wilson
Hilton of Fern,
Brechin.
Angus,
Scotland
> -----Original Message-----
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED]]On Behalf Of Neil
> Havermale
> Sent: 05 May, 2001 04:07 AM
> To: [EMAIL PROTECTED]; [EMAIL PROTECTED]
> Subject: RE: MI-L GPS, reply
>
>
> You are correct - WAAS only covers the US and most of Canada and Mexico.
> WAAS at this moment in time is governed by a geosynced satellite.
> It too is
> a US DOD system in cooperation with the FAA. It also has many of the same
> issues of satellite differentials that are broadcast from
> satellites - line
> of sight blockages count.
>
> The FAA is still in test / early delivery of their WAAS
> augmentation system
> and over time it too will improve. For our overseas guests, the
> WAAS is so
> obvious a solution for plane and other navigation that it too will come to
> their area - someday. A WAAS-like service is likely available
> most places.
> These alternatives require fees and additional hardware for real-time
> corrections. Pretty much all Garmins are RTCM correction capable.
>
> Another alternative is to do a postprocessed correction. Only certain GPS
> receivers provide the verbose form of raw satellite data needed. If a
> suitable matching benchmark site can be found or established,
> results can be
> very good anywhere. Garmin and Magellan have such solutions in
> very low cost
> products.
>
> Our group has used all sorts of diffential sources and methods over the
> years in the pursuit of sub-meter field navigation on tractors
> and combines.
> In my opinion and testing the WAAS is the best solution to date. It has
> very stable and high quality corrections, is essentially free, and totally
> transparent for the user - it just works. It also can be "turned-off" in
> times of uncertainty.
>
> For higher quality receivers like Trimble, sub-meter accuracy is readily
> achievable. Even sub $300 Garmins do much better than their advertised 3m
> WAAS guarantee.
>
> FYI
> MidNight Mapper
>
> -----Original Message-----
> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]
> Sent: Saturday, May 05, 2001 12:23 PM
> To: [EMAIL PROTECTED]
> Subject: MI-L GPS, reply
>
>
> neil is correct on the new GPS units, but when you read the info
> carefully -
>
> you will see the following warning/comment/note:
>
> *The WAAS signal is currently available in the US only in open
> areas or on
> the water
>
> On land, I am not sure how large an area is considered an 'open area'.
> Apparently, WAAS was developed by/for the FAA (federal aviation authority
> for
> non-US readers) for aircraft.
>
> s. Figuers
>
>
>
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