[Xastir] Question on site survey

[Jack Twilley]

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I've mentioned on xastir-dev that I'm running a site survey with my
M12 Oncore GPS in an attempt to identify precisely where my station is
located.

I've noticed something disturbing about the survey -- I've been
collecting data for roughly five days and my original estimate
(gathered from my Garmin GPS III+ in my car, and from Mapquest, etc.,
with my address) is reasonably accurate in latitude and altitude but
not longitude.

The amount of error in longitude is within 0.2% of 100 meters, with
the Oncore thinking it's 100 meters west of the Garmin's location.

That nice round number looked suspiciously like a datum problem, but I
checked with the @@Ao FF command, and I received "ID 49", which
corresponds with WGS-84 according to the Oncore documentation.

Suggestions?

Jack.
- -- 
Jack Twilley
jmt at twilley dot org
http colon slash slash www dot twilley dot org slash tilde jmt slash
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