TMQ AP4 Autopilot (AP4S10) 44 of 62 Version 4.96 9/10/2017
Check Rudder Drive Speed
The speed a rudder is moved by the autopilot drive unit will affect the steering
responsiveness of the AP4. A rudder lock to lock time of approximately 15
seconds* is required for good course holding.
*Optimum rudder speed will vary between vessels. A larger ship or slower boat
may require a slower speed. Rudder lock to lock angle is from 30º port
to 30º starboard.
1. Switch AP4 in PWR
2. Use a suitable timing device to check rudder speed
3. Rotate control knob until rudder is fully to port
4. Quickly rotate the control knob in starboard direction for a minimum of
3 turns. Time the rudder until it reaches starboard limit. Note the time.
The autopilot is now ready for full operational testing and sea trial.
Sea Trials
Basic Trial
Sail the boat to an area of calm and open water
Switch AP4 to SET
Check compass headings against boat compass
Carry out compass calibration only if necessary – see Compass
Calibration section on next pages. Note: It is rare for the AP4 heading
and boat compass to agree exactly on every heading due to magnetic
variations on the boat.
When boat is underway switch AP4 to AUTO.
Observe steering – adjust sensitivity and rudder response if required
– see page 16.
Note: Good course holding is also affected by drive unit lock to lock times. If
difficulty is experienced with course holding, check rudder drive speed.
Between 10 and 25 seconds lock to lock should allow the autopilot to
work successfully on most vessels.
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