GPS technology was invented by Dr. Friedwardt Winterberg, in 1955, at the age of 26: proposing to put atomic clocks into artificial satellites.
But Dr. Winterberg is also one of the best proponents of the ether theory of the 20th century.
http://zfn.mpdl.mpg.de/data/Reihe_A/44/ZNA-1989-44a-1145.pdf Substratum Interpretation of the Sagnac and the Aharonov-Bohm effect
Dr. Friedwardt Winterberg
Ph.D., Physics 1955 Max Planck Institute, Goettingen, Germany (Adv: Prof. W. Heisenberg)
1968-Present Professor of physics, University of Nevada Reno
1955-1959 Group leader theoretical physics division at nuclear research reactor in Hamburg, Germany, under President Eisenhower's "Atoms for Peace" program
Elected member International Academy of Astronautics, Paris, France.
Member of American Physical Society.
Recipient of the 1979 Hermann Oberth Gold Medal (the highest award in astronautical research given for his work on nuclear rocket propulsion).
More than 260 single author papers in refereed journals, two books, with many citations, including citations by the NY Times, Scientific American, Physics Today et al., 55 publications since 1992.
Now, what the RE have to explain is the MISSING ORBITAL SAGNAC EFFECT for GPS satellites, an effect which is 60 times greater than the ROTATIONAL SAGNAC EFFECT:
https://www.theflatearthsociety.org/forum/index.php?topic=30499.msg1983786#msg1983786 (four consecutive messages)