GR is general relativity, sorry, I'm too used to that convention.<br /><br />The velocity and gravitational effects are different. They <i>both</i> affect objects. Taking into consideration only one of the two produces erroneous results.<br /><br />GPS faltering will not be able to be corrected by maneuvering the satellites, as it is not a positional problem. It's due to trying to communicate between the GPS satellite due to it's motion <i>and</i> difference in gravity, and hear on the ground.<br /><br />GPS also compensates for their velocity.<br /><br />Now, having GR be wrong, even partly, and newton partly right is an interesting proposition. GR says newton is <i>completely</i> correct as long as you are not at high gravity, high acceleration, or high speeds (I mean really high here btw). It's merely a matter of accuracy. General relativity gives the same answers as newton, as long as you're not going a significant fraction of light speed, and the difference in gravity isn't too high.<br /><br />Even mathematically GR produces newtons laws of motion if you put in low speeds and velocities.<br /><br />For instance, take the mechanics equation for velocity:<br /><br />Newton says: v=at<br /><br />General relativity says: v=at / sqrt(1+a*t/c^2)<br /><br />However, if a is small, say only 10 m/s over 10 seconds:<br /><br />newton says: v = 10 m/s^2 * 10 s = 100 m/s.<br /><br />General relativity says: v = 10 m/s^2 * 10 s / sqrt(1 + 100/ 3x10^16)<br /><br />100 / 3x10^16 is very small (~1x10^-14, or 0.000000000000001)<br /><br />So 100 m/s / sqrt (1.000000000000001) gives...well, basically 100.<br /><br />mathematically, at low speeds a*t is much less than c^2, as such that term can be dropped from the general relativity equation since it produces a value so close to zero.<br /><br />General relativity at low speeds now says: v=at / sqrt(1+0)<br /><br />After simplifying it produces v=at/sqrt(1) = at. The same as Newton. <div class="Discussion_UserSignature"> <p align="center"><font color="#c0c0c0"><br /></font></p><p align="center"><font color="#999999"><em><font size="1">--------</font></em></font><font color="#999999"><em><font size="1">--------</font></em></font><font color="#999999"><em><font size="1">----</font></em></font><font color="#666699">SaiphMOD@gmail.com </font><font color="#999999"><em><font size="1">-------------------</font></em></font></p><p><font color="#999999"><em><font size="1">"This is my Timey Wimey Detector. Goes "bing" when there's stuff. It also fries eggs at 30 paces, wether you want it to or not actually. I've learned to stay away from hens: It's not pretty when they blow" -- </font></em></font><font size="1" color="#999999">The Tenth Doctor, "Blink"</font></p> </div>