Settings menu, Steering, 2 settings – Simrad AUTOPILOT SYSTEM AP50 User Manual
Page 150: Menu, W init rudder, W autotrim autotrim, 2 settings menu

Simrad AP50 Autopilot
148
20221032B
6.2 Settings Menu
SETTINGS
STEERING
THRUSTER
No
Yes
Note ! 
 
Select SETTINGS in the Installation Menu by pressing the 
(STBD) button and confirm this by rotating the course knob 
clockwise. 
Two groups of settings are available; Steering and Thruster 
(only when thruster is installed). 
If a thruster is not installed, the Steering menu appears when 
entering the Settings menu. 
Use the
(PORT) or
(STBD) buttons to move through the
menu items. Turn the course knob clockwise or counter 
clockwise to adjust the values. 
Steering
Select STEERING by pressing the (STBD) button and 
confirm this by rotating the course knob. 
W Init rudder
SETTINGS
W Init rudder Midship
W Autotrim Yes
Autotrim 48sec
Course adj. 1°
Compass diff. 10°
Off heading lim 10°
Drive engage Byp/clutch
Drive type Motor
Drive out 62%
Select between Midship or Actual rudder position in Work 
mode. 
When “Midship” is selected, the autopilot will use zero degrees 
as the midship reference. Hence, the rudder will always move 
to midship when switching from STANDBY or DODGE mode 
to AUTO-WORK or NAV-WORK mode. 
When “Actual” is selected, the autopilot will use the current 
rudder position as the midship reference (bumpless transfer) 
when switching from STANDBY or DODGE mode to AUTO-
WORK, or NAV-WORK. 
Note !
“Midship” will always be used when switching to AUTO or 
NAV from STBY/NFU/FU. 
W Autotrim 
Rotate the course knob to turn the Autotrim function off or on 
in the AUTO-WORK and NAV-WORK modes. 
Autotrim 
When the vessel has a constant heading error due to external 
forces such as wind and current, the Autotrim function corrects 
for this by building up a constant rudder offset. 
The value for the Autotrim parameter is the time it is allowed to 
calculate the rudder offset. 
The Autotrim value can be adjusted from 10 seconds to 400 
seconds with the course knob. The default value depends on the 
boat length. 
