What about the time delay between ground and geostationary satellites? I once helped get an initial STC to put a Satphone in a Lockheed JetStar and I can tell you there is a noticeable delay when you are bouncing signals from low altitude to space and back. Not a huge delay, mind you, but enough to make carrying a simple conversation a little awkward. When we are expecting near-instantaneous position communications between aircraft and satellites, could the delay be substantial enough to skew the warnings?