GPX as submission format (Was: [Openstreetmap] london free maps...)

[Petter Reinholdtsen]

[Matt Amos]
> having actually read the format in detail i can say: it does support
> PR and ephemeris, in the extensions field. PR (pseudo-range) is a
> measure of time for signals to reach you from each satellite. its
> the raw data from which the GPS unit calculates your
> position. ephemeris is positional data about the orbits of the
> satellites.

Sounds good.  Do I understand you correctly when I believe collecting
the pseudo-range and ephemeris will allow us to post-process the
collected data with DGPS information to make it more accurate?

I have no idea if my GPS support this, but will try to find out.