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 at
the instrument are a true indication 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.
4.2 User calibration
The User calibration procedures enable you to:
• Set the required units for depth readings.
• Set the offset for depth readings, i.e. determine whether depth readings are
from the keel of the vessel or from the water line.
• Lock the shallow alarm.
• Set the required units for speed readings.
• Set the speed resolution.
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