Conclusions The main unknowns before testing were the usability of the Mead-Fairfield model at radii lower than its design regime and how much momentum could actually be dumped by onorbit satellites using the magnetic control technique. It was found that the magnetic momentum dump algorithm works well with on-orbit GPS satellites using the Mead-Fairfield magnetic field model. As of Nov. 1, 1979, a total of 15 tests had been run with the four satellites in orbit at that time. The method has succeeded in dumping up to 0.33 N-m-s excess angular momentum in two orbits. For the specific satellite/orbit geometry combination tested, this corresponded to a buildup occuring over about 12 days.