Lets say you have a flying unit, for instance a scout, how do you detect what direction its moving in? How accurately can you do this?

You'd use a mobile grid, and it can be as accurate as a 1/4 x 1/4 square, IIRC.

You can't really assume how experienced people are, someone needed to say it.

There are a few ways, it really depends on what resources you can dedicate to it and how accurate you want it. For instance, with mobile grids you can center a bunch of locations around the unit detect which it is in wait x amount of time and recheck, the difference in position (based on locations it is in) is the direction.

You could also use a location grid to get unit positions- look up FRAGS material.

Lethal just taught me a pixel perfect way to detect how the x and y coordinates of a unit change from one trigger cycle to the next. It uses inverse locations.

So yeah, this topic is kind of moot now.