WH40k Tau Markerlights in GURPS?

[The Benj]

Originally Posted by vicky_molokh

Let's see. You need at least one LASER rangefinder for the marking-up unit.
You need your units to have 3D Spatial Sense. An inertial compass or a GPS will do nicely. This is important both for positioning and for determining direction. With precise knowledge of both, you no longer need triangulation when lighting up an enemy for other units.
Now, you need to use a TacNet to make sure you synch the positions and facings of all units; with that, you can pinpoint the positions of any lit-up targets.

Thus, all units in your net will gain the +3 provided by rangefinders to hit the lit-up unit (non-cumulative, of course), will never have to guess in which hex the unit is, and will negate most issues of reduced visibility.

The fella with the pointer can also simultaneously use his/her/its Forward Observer skill as usual for artillery or whatever.

Don't forget you only get the +3 if you Aim, but otherwise, this seems the best way to handle it.