Raymarine Compass Instrument ST40 - Manual (Page 32)

Chapter 4: Calibration 23
Chapter 4: Calibration
4.1 Introduction
The procedures in this Chapter must be carried out before the
equipment is used operationally, to optimise the performance of the
instrument with the vessel.
Calibration information is presented in flow chart form. The flow charts
show the various calibration screens and key presses necessary to carry
out calibration. All key presses are momentary unless otherwise stated.
EMC conformance
• Always check the installation before going to sea to make sure that it
is not affected by radio transmissions, engine starting etc.
4.2 User calibration
User calibration enables you to:
• Set the compass heading response values. Use higher response
values for rapid updates in reasonable sea conditions (for
example when you are trying to maintain a locked course). Use
lower response values in choppy sea conditions to damp out
unstable readings.
• Set the magnetic variation.
• Set the heading reference (magnetic or true).
• Linearise and align the compass.
Power up the instrument then follow the procedure in the User
calibration flow diagram.
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