Is unit moving?

Hi!
Is there some way of finding out if an unit is moving or not?
The only way I can think of is storing the unit's location, then wait a while and then check if the current unit's location == stored location, but that's kinda... Meh.
Isn't there an alternative?

Actually that's the most.... "effective" way....

I use this method and it works properly

I gues I'll have to go with it then