It updates position and transmits once per second. I wonder if that makes it useful as a homing signal for a missile. Or perhaps the position resolution isn't close enough for that?
I suppose the benefit of knowing where everything is a security plus. Watching 9/11 documentaries, it was surprising how many aircraft the controllers couldn't account for.
Not so useful for a plane traveling at 800 km/h. And it's transmitted with radio so anyone can pick it up without internet. But if you want to fire something at a plane there are much easier and cheaper things to use from the ground.
