guidance system
guidance device

She also had made out the words airspace and guidance systems.

The guidance systems of the world had to fail, even if only for a few moments.

Both can be used at night because they have infrared guidance systems.

Its guidance systems are more or less off the shelf.

Even this isn't bad compared to the effect it had on the guidance systems.

As I'd have expected, the guidance system was separated from the missile itself.

That had to be the guidance system; I'd wondered what it looked like.

It might have taken us months to imitate such a guidance system.

Still, something in her internal guidance system had seemed to cry out that last time.

We've seen everything but the guidance system in the monastery with our very eyes.