Avoid Notice

exploration

Category defensive;

You attempt a Stealth check to avoid notice while traveling at half speed. If you're Avoiding Notice at the start of an encounter, you usually roll a Stealth check instead of a Perception check both to determine your initiative and to see if the enemies notice you (based on their Perception DCs, as normal for Sneak, regardless of their initiative check results).

Source: Pathfinder Player Core
ORC