How to mark enemies in Call of Duty Modern Warfare

From the Lobby go to Weapons Section and click on edit Loadouts. It will unlock a separate menu to choose Primary Weapons, Secondary Weapons, Perks and Explosives. Go to perk section and there are additional three slots, for Perk 1, Perk 2 & Perk 3.

Go to the Perk 3 section AMPED and check the last two slots, Spotter and Tracker. Spotter will help you to find enemy equipment’s, field upgrades and killstreaks i.e Munition boxes. You can track down all the items through walls and also mark it for your friends. Tracker can help you to track down enemies.

The Amped slot will allow you to use only one perk at a time, but you can create upto five custom loadsouts with different weapons, perks and killstreaks. In this way you can instantly shift to a new loadouts to choose the right perk for your requirement.