Stances

How Stance effects Vision
  Stance %of max possible
Running 25% (Worst)
Crawling 25% (Worst)
Standing 100% (Best)

Standing has four times the vision of running and crawling.

How Stance effects Stealth

Stance %of max possible
Running 12% (Worst)
Crawling 100% (Best)
Standing 50%

Standing has four times the stealth of running.
Crawling has eight times the stealth of running.

Changing Stances

To change a person's stance, double click the left mouse button on the person to bring up the Stance dialog. Select the desired stance.

There is no energy cost to change stance except for the:
Digging Stance: 36 energy units. Starts digging immediately.
12 energy units for trappers.