Actually a very interesting program and one I am signing up to participate in. Check out GIPSY-OASIS:
It is used for precise location and surveying - normally we use the network of GPS satellites but there are errors and orbital perturbations which limit accuracy to a couple of yards for consumer receivers and a couple feet for survey grade receivers.
With GIPSY-OASIS, the errors are determined and a back-correction is calculated so that the accuracy is a lot better. I am interested in this as I have been noticing a lot of land movement in the last couple of years. Our own main highway (SR-542) has three places where it has been reduced to a single lane because of movement in this year alone. There are other rural roads that are closed. A logging road across from my street has had a large measure of land movement. This way I can get quantitative measurement with some consumer-grade GPS receivers.
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