Seiwa SW AP01 - Manual (Page 29)

The Rate Factor compensates for turning inertia in the vessel and its choice is
affected by both the displacement of the vessel and its directional stability. If 10
degrees of helm is applied and the turn is established within 1 to 3 seconds, then a
Rate Factor of 2 is suitable. If it takes 5 to 10 seconds to reach the full turn rate, then a
setting of 4 or 5 is suitable. Setting the Rate Factor too high can produce excessive
rudder activity and slow down the completion of a course change. Setting it too low
produces over-shooting during course change.
28
28