General relativity is more accurate that Newton's force over distance squared formula when it comes to 1) the orbit of Mercury around the sun, 2) very precise locations of GPS satellites, and 3) the gravity in a galaxy about half way out from the black hole in the center. Beyond that distance from the center of a galaxy, gravity is so weak, General relativity does not account for all the gravity. Dark matter is the popular hand waving for outer galaxy orbits and galaxy cluster orbit velocities.
Still, sending a probe to Mars? Good old Newton math is good enough.
General relativity was verified 100 years ago by light bending around the sun in an eclipse.
Putting gravity waves all over in the news is much ado about nothing, unless you are Kip Thorne. He has just about been squeezed out of history by the liberal wikipedia.
