[Basilides]

Actually the latest speed was mentioned at 4000 mph...or a little less than Mach 6

[Steel Wolf]

I've been jumping out of military jet aircraft for years, and I can feel the difference between every 20 knots of increased speed. The hardest I've ever felt seemed like a full body punch, and that was at a tiny tiny fraction of Mach 6. I've never seen the numbers, I can't imagine anyone even surviving an unshielded bail out at Mach 1. It would be like being struck by an invisbile wrecking ball at full swing.

[TomB]

The point remains. It would be virtually impossible to track.