His competence is limited to what is visible or audible. He can not see a drawing hidden under a carpet but could for example notice chalk dust on the edge of the carpet.
If the character is trying to follow someone's trail. He may roll a die 6.
On a 1,2,3,4 this Feat has no effect.
On a 5 or 6 the character is considered to have the [[Tracker]] Feat momentarily.