BI already gave you directions. If you look at your tasks (on the map screen), the task about finding spotters has a clickable link that takes you to the right location.This is how I won after I couldn't figure out how to activate thermal :)
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How do you actually paint/designate the spotters once you've found them? I've tried clicking on them from both the driver and turret positions of the drone, but nothing happens (except the cursor changes to/from a plus), even when I keep looking at them for 20 seconds.
In then end, I won this mission in the dumbest way possible. The spotters noticed my drone and started moving around, but couldn't bring themselves to shoot it for some reason. (The enemies to the north were happy to shoot it down, but these guys must be scared of technology or something.) Eventually, they moved all the way into Girna, where they were shot by NATO troops, completing the objective. This isn't how the mission was supposed to work, right?