The information panel of a selected contact should show what sensor provides the position/bearing data. It could be 'link data', think of it as position info of friendly units transmitted over a secure communications channel. However it seems like it can defy the laws of physics in terms of receivability. How would you receive such data if your radio cable isn't streamed out. I'm stumped.
I don't know the mission, but if there is a layer, then do make sure you listen under it. Realise that you do not have to be in it, to listen in it. You've got a microphone on a cable behind you.
Also, you may have to alter your screen brightness/contrast/gamma settings to make all lines visible. The rest of the interface might start to look ugly, but that really faint line at 50 Hz is allways a pearl to see.