Move Silently (Dex) Armor Penalty
Check: A character’s Move Silently check is opposed by the Listen check of anyone who might hear the character. A character can move up to half his or her normal speed at no penalty. At more than half speed and up to the character’s full speed, he or she takes a –5 penalty. It’s practically impossible (–20 penalty) to move silently while attacking, running, or charging.
Time: Move Silently is a move action.