Differentially correct GPX file

Question

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?

Answer 1

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