I hate the Thermal Boards. Someone who really socks has a chance to Shoot you in the Head.. But on the Nightfall and jungle boards I scan once with Thermal. If I don't see them I turn it off. They are probably looking for you. So there Light tells you right where they are.

The best way I have found is to just sit still. Turn your screen sensitivity way up. Once you see his light tap the scope Zoom and Fire. This can happen in seconds..

What is the Best Way to find your Target in PVP?