TMQ AP4 - Page 17

TMQ AP4 Autopilot (AP4S10) 17 of 62 Version 4.96 9/10/2017
 Sensitivity
This adjusts the rudder sensitivity (sometimes known as dead band) which
varies the tolerance to the position of the rudder from the control in auto
mode. This setting relates directly to the dead band of the vessel’s
direction, in other words, how much “wander” is allowed before the
autopilot reacts to correct any change.
Increasing the value of this setting, will increase the tolerance to the
rudder position error. Decreasing it will make the rudder position and the
vessel’s route more accurate, but decreasing to much may make the vessel
oscillates to much around its direction.
 Rudder Ratio
This control adjusts the rudder ratio which varies the amount of rudder
applied for a course error.
To adjust sensitivity
 If Display is reading Heading 000-365 pull out centre knob
 Display will read a number eg: 05
 Adjust the knob anticlockwise until pilot just begins to hunt (this is
indicated by the port and starboard lights flickering)
 Turn knob clockwise until lights are not flickering.
 Push knob to set and back to compass display.
To adjust rudder ratio
 Display is reading Heading 000-365
 Rotate centre knob
 Display will read a number eg: 06
 Adjust knob until boat steers a straight course. Note the reading.
 Display will return to Heading
 If Display is indicating Rudder Angle Push button to Heading display.
Note: The sensitivity and rudder are normally adjusted together with sensitivity
being adjusted first, then rudder ratio.
The sensitivity should be adjusted so that the AP4 is not continually driving
back and forth (hunting) as this can prematurely wear your steering system
If the centre knob is left out after the sensitivity is set, when 3 seconds has
elapsed, the AP4 display will read rudder angle.