[OSM-talk] SBAS - (EGNOS / WAAS)

[Barnett, Phillip]

I have by default since I bought my Legend Cx in April - it was one of
the features I was looking for in a unit. It doesn't always work,
obviously, but when I can pick it up I find I can get about 6ft
accuracy, rather than the more normal 15-25ft accuracy. I've made a
couple of traces of the same road, (a winding country lane)at different
times, and found that the trace made when I was at 6-8ft accuracy looked
considerably different to the 25 ft accuracy of the second run. In
particular, the second run appeared systematically offset by (very
roughly) 15ft North but parallel to the first trace.

Incidentally, when looking at traces on the slippy map, I get the
distinct impression that it's not quite coincident with the tracks I'm
tracing. What geodesic is it using - WG84?

Phillip

-----Original Message-----
From: talk-bounces at openstreetmap.org
[mailto:talk-bounces at openstreetmap.org] On Behalf Of Andy Robinson
Sent: 30 June 2006 12:18
To: talk at openstreetmap.org
Subject: [OSM-talk] SBAS - (EGNOS / WAAS)

Out of interest, who has SBAS (Satellite Based Augmentation Systems) ie
WAAS /EGNOS turned on and active on their handheld (or other) GPS units
when logging?

With Europe's EGNOS setup due to commence "Initial Operations" from
INMARSAT
3 F2 (AOR-E) (Garmin ID 33) in the next few days I suspect it will get
some publicity. Obviously the testbed has been running some time now but
clearly the platform is moving to a more reliable phase beyond testing
and I guess we should all be using it if we have an SBAS enabled GPS
receiver.

In the UK I can generally only pick up satellite ID 33 on my Legend, I
assume that most others in Europe are picking up both 33 and 44? (44
being INMARSAT 3 F1 (IOR))

Any feedback on whether the activation of SBAS on your GPS is actually
improving the traces you make?

Also, is anyone actually using DGPS (ie differential GPS using 2
receivers) for logging?

As I say, just for interest, although partly aimed at considering best
practice and urban mapping issues.

Cheers,

Andy

Andy Robinson
Andy_J_Robinson at blueyonder.co.uk 




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