Furuno AUTOPILOT NAVPILOT-500 - Manual (Page 33)

3. STEERING MODE
3-17
The FU is one of auto steering modes, which outputs an absolute value
determined with the course control knob to drive the rudder, thus changing the
ship’s course at a given rate of change towards a set point..
2. Rotate the dial on the remote controller to set the rudder angle.
The angle must be more than 10°, otherwise no steering will occur.
Rotating dial
3. When you terminate the REMOTE mode, turn off the remote controller.
Turning power off (dial type)
Control is returned to the main control unit and the mode that was originally
active (AUTO or NAV) is restored. For the NAV mode, the boat will go to the
destination waypoint based on the (COURSE or XTE) Nav steering method
menu setting See paragraph 3.3.2. for an explanation of this setting.