Bernie, I am very interested in this. I know that geosynchronous satellites have thrusters to correct for lateral drift, but I did not know that they had "vertical" thrusters. Do you have any more info on this? In particular, the thrusters would need to be of very low power, but constantly running (solar power/battery). Neville. Bernard Brauer <bbrauer777@xxxxxxxxx> wrote: The gravitational field strength is very weak at the 22,236 altitude, because of the inverse square distance rule. So the satellite would just need a small strength vertical thruster to keep it in place. I read they do indeed have thrusters. Bernie --------------------------------- Now you can scan emails quickly with a reading pane. Get the new Yahoo! Mail.