He means Auto-Spotter. When you hit select and you're looking at an enemy it'll make a orange triangle arrow thing appear above his head, it shows that arrow for the whole team, it's like a UAV but on one person only. You also get points if he is killed by your team while it's still showing, and you get even more points from him dying if your squad kills him. You just have to make a macro that hits the Select button every 1-2 seconds, and then put it on the left trigger, so it aims in, and auto spots for you. Theres also a sniper perk that does it.
http://vikingforums.com/viewtopic.php?f=24&t=847