Expert Scout is a recon gear perk that makes you tag enemies faster. It suits players who scout a base before going in and want every soldier marked quickly.
When you tag enemies with your phone, the marker locks on faster. You spend less time exposed on a ridge while scouting.
Handy for stealth players who mark everything first. Loud players will get more from a defense perk on the head slot.
Hunter's Mark boosts damage against tagged targets, so the two fit a scout-then-strike style.