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Simrad AP25 Autopilot 
122
 
20221495F
 
Recommended speed during Automatic tuning varies with the 
type of boat, but should not exceed 10 knots. It should be 
performed in calm or moderate sea conditions. 
Note ! 
Automatic tuning should not be performed at planing speed or in 
following seas!  
For displacement boats use a speed that is approximately half the 
normal cruising speed (i.e. if cruising speed is 10 knots, perform 
the Automatic tuning at about 5 knots). 
The parameter values calculated during Automatic tuning 
becomes the HI parameters. The LO parameters are 
automatically set to 66% of the HI. 
It also is recommended to perform the Automatic tuning steering 
East or West, as this will yield the best balanced parameters. 
Note ! 
After the Automatic tuning has been completed the rudder must 
be controlled manually, as the autopilot has returned to STBY 
mode. 
Caution ! 
The Automatic tuning function will take control of the boat 
and perform a number of S-turns. It must always be performed 
in open waters at a safe distance from other traffic. The 
Automatic tuning function may take from 1 to 2 minutes to 
complete. To stop the Automatic tuning, press the STBY 
button. 
Activate the Automatic 
tuning, by rotating the course 
knob clockwise. The display 
will flash “Automatic tuning”.
After an Automatic tuning, there should be no need for further 
adjustments. “Fine tuning” of these parameters are made by the 
response control (see page 56). However, viewing or changing 
the parameters can be made from within the Parameter menu 
item. See also “Recall Autotune” on page 128. 
Proceed to the next menu item by pressing the STBD button, or 
return to Standby mode by pressing the STBY button.