Neutral (Straight) Rudder Position no longer Zero Degrees

[Sdpaddler50]

I have noticed neutral rudder in Standby steering has shifted 1-2 degrees to port over the last couple months. IE, the boat will steer straight (low wind and current) with 1-2 degrees left rudder and its no longer 0 degrees to maintain a straight course

I run the boat (new in 2018 - first owner) every week and longer trips in the Summer so it gets used a lot and I am aware of her nuances.

Do these systems get out of calibration and need to be reset?

I have the manual and will start going through it, just looking for some ideas to troubleshoot at this point.

Nav pilot 711-C
SC30 Sat Compass is Primary, PG700 Back up - not relevant to this, just FYI
Sea star hydraulic cylinder
2018, 46 Ft, Deep Keel, Single Engine Trawler w Barn Door Rudder

 

[Titanic II]

If the rudder trim is absolutely 0 degrees to maintain a straight course when hand steering, then mark where the rudder is physically to hold a straight course. Then you redo the Dockside setup Set Center Rudder and the Rudder Sensor Alignment using that mark as the center. It will store that as 0 degrees. Then do the sea trial "Set Center rudder" again to set the rudder trim, if all was aligned properly with the mark it should read 0 degrees in calm seas.

 

[Sdpaddler50]

Titanic, I was in the water today, looking at the rudder from directly behind it and the rudder angle is at approximately 1-2 degrees right rudder with the AP showing “O” degrees. This matches up to what I initially wrote. Thanks for the info, but can you give me the direct reference from the manual? I cant find that section in my manual. I realize its a basic change, but I have a couple trips coming up so I want to be sure I do it exactly per the book and don't mess things up.