So you find yourself a nice little bush behind near your spawn and you decide to take up a nice little seat right behind it.
No one can find you here. Now you can shoot those red tanks all day and they won't be able to see you to shoot back. In the spur of this exciting moment, you can't contain yourself and you blurt out your insecurities over global chat.
...bad idea, hombre.
Ever hear of something called radio silence? Well, you'll soon learn.
Suddenly, that lightbulb in the middle of your screen lights up and the angry shells of Russian biased heavies rain down upon your tank...and whatever shreds you have left of your ego.
How did this happen, you ask?
See, your foolish outburst was sent out in the same frequency as set on the radios of the enemy tanks and they quickly picked it up. All that was left was triangulating your position and BOOM!
So, for future reference, here's a pro tip: when you're trying to hide from red, don't use the coms. They pick up what you send and they'll soon triangulate your location.