On Wed, Sep 28, 2011 at 10:59 PM, Thomas <[email protected]> wrote:
> I thought it was more like owning the casino and dealing from your own
> card deck.

I suspect that what lbendlin is trying to say is that you are making
an assumption: that the error introduced in one GPS coordinate has a
relationship to the error introduced in other GPS coordinates:

"No matter,  I only needed today’s apparent location from a fixed
point and I had the apparent location for the fixed location.  The
other waypoints were all in relation to the given point on the
measurement day.  All I had to do was determine the offset between
today and the original measurement day and I could add the offset to
all the other points as the game was being played and the waypoints
would maintain their relative distance even though the apparent
location had shifted."

It is entirely possible that GPS works that way -- I haven't
researched the point. However, I certainly wouldn't assume it works
that way. Moreover, it would stun me if it *did* work that way, at
least for consumer-grade GPS.

-- 
Mark Murphy (a Commons Guy)
http://commonsware.com | http://github.com/commonsguy
http://commonsware.com/blog | http://twitter.com/commonsguy

Android Training in NYC: http://marakana.com/training/android/

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