Final answer:
The "rudder adjustment" control on an autopilot steering stand is used to change the rudder angle.
Step-by-step explanation:
The "rudder adjustment" control on an autopilot steering stand is used to change the rudder angle. This control is typically found on aircraft or marine autopilot systems and allows for precise adjustments to the rudder position. By changing the rudder angle, the autopilot can effectively steer the aircraft or vessel in the desired direction.