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I believe in GPS satellites relativistic effects are due in greater part to the difference in gravity between the surface of the earth and the satellite, more so than the special relativity effects.

According to a reference[1] from Wikipedia[2] the effect would be 45 μs for general relativity 7 μs for special relativity, combining into a 38 μs drift.

So although you are technically correct (45 > 7) they are both significant.

[1] http://www.astronomy.ohio-state.edu/~pogge/Ast162/Unit5/gps.... [2] https://en.wikipedia.org/wiki/Global_Positioning_System#Hist...

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