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Few people stated previously that time dilation is a proven fact. It certainly is not. What is proven is that physical forces can slow or speed up clocks (and physical processes). It was known long before Einstein that rises in the temperature will lengthen pendulum and therefore slow the clock. Is it time dilation? And how does it differ from the clock on board of spaceship travelling at high speed. If I stand close to the pendulum clock that I heated up, is the time for me flowing slower? I don’t think so. That does not prove that the time itself actually slows down. No one knows what time is and if it actually exists. It may be just our invention to describe sequences of events happening.
As for GPS being practical example of GR, not really as it is using the Earth-centred inertial frame (universal frame) of reference to synchronise clock on the satellites. This is more in agreement with Lorentz relativity then GR
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