Final answer:
True.
The GPS satellite system is very accurate because of general relativity, specifically special relativity and gravitational time dilation.
Step-by-step explanation:
The statement is true. The GPS satellite system is very accurate because of general relativity. General relativity takes into account two effects: special relativity and gravitational time dilation. Special relativity accounts for the slower motion of satellite time relative to an observer on Earth, due to the satellites' speeds. General relativity accounts for the faster ticking of time on the satellite due to the weaker gravitational force on satellites in orbit. Without taking these relativistic effects into account, GPS units would lose their accuracy in a matter of minutes.