If you shoot without a silencer, you remain on the radar for about 5 seconds, I think. You're not moving though, like in BF2, but rather a fixed red dot.
It's the same with the UAV. The red dots last until at new sweep is performed, which shows the enemy's new locations. A new sweep happens every 2 seconds (I think). I think a UAV lasts for about 30 seconds, maybe 20. All this can be changed though, since CoD4 is pretty dynamic.
edit: Ninja'd
It's the same with the UAV. The red dots last until at new sweep is performed, which shows the enemy's new locations. A new sweep happens every 2 seconds (I think). I think a UAV lasts for about 30 seconds, maybe 20. All this can be changed though, since CoD4 is pretty dynamic.
edit: Ninja'd