WH40k Tau Markerlights in GURPS?

[Tema69]

For the unitiated: http://warhammer40k.wikia.com/wiki/Marker_Light

How would you model this in GURPS?

There are three types: markerlights (allows other units to benefit), high-intensity markerlights (longer range) and networked markerlights (allows your own unit and other units to benefit). I'm partial to thinking that the differences are a matter of training and/or balance issues, so I don't think there'd be a difference in GURPS terms.

It appears to me that the main benefits are:
-bonuses to hit (could be as simple as the UT targeting laser)
-call in missiles (again, a missile that homes in on the far end of the beam)
-"paint" the enemy, removing darkness/concealment/cover penalties

And, of course, that these bonuses are linked to the rest of the units.

I'm thinking a combination of Silhouette, Targeting, and Target Tracking software, all linked to the laser beam, that is relayed through a comm device to the others, who can then benefit from the software.
What about multiple markerlights painting the same target then?