gpsd doesn't do the position determination, it's more or less a clearinghouse for the data once it's been calculated. Actually taking the raw waveforms from th

gpsd doesn't do the position determination, it's more or less a clearinghouse for the data once it's been calculated. Actually taking the raw waveforms from the ADCs and turning them into a (position, velocity, time) solution is an entirely different task. I'd be remiss if I didn't mention RTKLIB, which is an open-source package to do the PVT solving, using a whole bunch of different algorithms. It ALSO happens to include a bunch of plumbing to stick the pieces together, and thus in some ways overlaps functions of gpsd, but its primary function is actually solving the navigation equations.