With single screw and 6.5 turns lock to lock, the rudder indicator on the AP gets looked at all the time. Docking especially, but even making a turn. Go to 5deg, wait for turn to start, then to about 2deg and let turn finish, then to neg 5deg to stop turn, then back to zero.
If no display on AP, an electric gauge kit is available that is modest cost.
When running a boat with twins, or with fast steering, I don't really need it. With twins I usually leave rudders centered when docking unless needing to crab. The display is still handy but not as handy as on a single.
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