QUOTE(zahirani @ Jul 22 2010, 10:36 AM)
1. if the enemy use the UAV killstreak, it will reveal ur locations as a red dot on the minimap (upper left corner on the screen)
Counter-measure; Use "Cold-Blooded" perk
2. enemy maybe using an attachment called "heart-beat sensor", this attachment will reveal the opposition team location on a periodic time cycle
Counter-measure; Use "Ninja" perk
3. if u fired ur weapon (without silencer attached), ur position will be reveal on the map as a red dot and the enemy will be able to know ur location
Counter-measure; use a silencer attachment or just use knife only haha

answer from ur statement
1. will check this out tonite
2. i know abt this but sometime my enemy was not using this heart beat sensor.
3. yes i know about little map at upper left side in screen, but sometime im just doing nothing, never use a weapon but still people can find me.
maybe ur first statement answered to all to this