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Is there any way to differentially correct a GPX file using free or open-source tools? Does a GPX file contain the necessary information for differential correction (I can put the timestamp in it accurate to 1s)?

As an aside, do I need to disable WAAS on my receiver for this to work?

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up vote 2 down vote accepted

Typically you need raw pseudorange and carrier cycle data to perform post processing, which is not usually contained in GPX.

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Good point, I was thinking time was the only think I needed. Thanks! –  mattwigway Feb 10 '12 at 17:02
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