Face it, as much as you can geek out on anemometers and their response times and accuracies, I get the same way on geospatial measurements

as to the satellite orbits

http://www.gmat.unsw.edu.au/snap/gps...p2/222sats.htm

The applicable text is

"The Block II satellite series have been deployed in six orbital planes at 60 intervals about the equator, with each containing 3 or 4 of the primary satellites equally spaced in the orbital plane (Table below). The orbital planes are at an inclination of 55 relative to the equatorial plane. According to deployment plans there are to be 3 active spare satellites spread evenly in addition to the primary 21 satellite configuration. However, the reality is that satellites are launched at predefined intervals, and if the constellation health is maintained, often more than the minimum 24 satellites are available. For example, at the time of publication of these notes (September 1999) there are 27 satellites transmitting signals that users can track."

And I do appreciate your knowledge on the instrumentation used in meteorology. And most particularly, your willingness to share it.