Raymarine ST600R Owner's Handbook Manual page 80

Chapter 7: Post Installation Procedures
2. Refer to Chapter 5, "Customising the System", for instructions on
3. Repeat the test until a crisp course change with no more 5° of
These actions are most easily recognised in calm sea conditions
where wave action does not mask basic steering performance.
how to adjust the default rudder gain setting. Note that you can also
make temporary adjustments to rudder gain during normal operation
(see Section 3.3).
overshoot is achieved.
The rudder control setting should be set to the lowest setting
consistent with accurate course keeping. This will minimise helm
movements and hence reduce power consumption and wear and
tear.
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