Raytheon ST6000 Plus - Autotack to Port; Off Course Alarm

8 ST6000 Plus Autopilot Control Unit Owner,s Handbook
AutoTack to port
 Press the -1 and -10 keys together to tack to port .
Off course alarm
The off course alarm will sound if the locked autopilot heading and the
vessels current heading differ for more than 20 seconds, by more than
the alarm angle set in calibration (the factory default is 20°).