Chapter 4: Calibration 27
Chapter 4: Calibration
4.1 Introduction
The ST60 Tridata instrument is set up with factory-programmed
default settings, so in order to optimise the performance of the
instrument on board a particular vessel, the procedures in this Chapter
must be carried out immediately after the completion of installation
and before the equipment is used for navigational purposes.
Where practicable, the calibration procedures are presented
diagrammatically to show the sequence of key presses and the
resulting displays. Adjustment instructions are given as applicable.
Speed readings
One of the reasons for calibration is to ensure that the speed readings
displayed on the instrument are a true reflection of the actual speed of
the vessel.
In User calibration - Speed, you can:
• Automatically set the displayed speed reading to be the same as the
Speed Over Ground (SOG) (if SOG data is available).
• Manually apply a calibration factor, to set the displayed speed to the
required value.
If neither of the above methods are suitable, you can carry out a speed
calibration run over a measured distance, to enable the instrument to
calculate the correct calibration factor. This is described as part of
Intermediate calibration.
EMC conformance
• Always check the installation before going to sea to make sure that
it is not affected by radio transmissions, engine starting etc.
• In some installations, it may not be possible to prevent the
equipment from being affected by external influences. Although
this will not damage the equipment, it can lead to spurious resetting
action, or momentarily may result in faulty operation.
040_2c04.p65 09/08/99, 09:3227
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