It's a simple time/distance formula. They plot out 2 points visible from the air. They watch vehicles travel between the two points and time how many seconds takes to get from Point A to Point B. Basic algebra with speed and time gets an average speed that vehicle traveled between those two points.
If you've already called and left a message, you'll just have to wait until next week to see if they call you back.
Of every one hundred men, ten should not even be here. Eighty are nothing but targets. Nine are real fighters, and we are lucky to have them, for they make the battle. Ah, but the One... One of them is a Warrior... He will bring the others back.
"Wrong door, buddy!"
Let no man's ghost say my training failed him.