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Chapter 4: Calibration
21
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 required units for speed readings. Either KTS (knots), MPH
(miles per hour) or KPH (kilometres per hour).
• Set the required distance units. Either NM (nautical miles), SM
(statute miles) or KM (kilometres).
• Select water temperature units. Either °C or °F, as required.
• Set the speed display response. Use higher response values when
boating in conditions requiring rapid updates of the current speed
(e.g. competition sailing or on power boats). Use slower response
values when you require an average speed over a longer period of
time (e.g. when cruising, especially in heavy seas).
• Set the correct speed reading, either by using a Cal factor screen to
adjust the calibration factor, or by applying Speed Over Ground
(SOG) as the current speed. Your vessel must be moving at 0.5 KTS
or more and be receiving SeaTalk SOG data, to enable SOG to be
applied as the current speed. This should be done only in conditions
of zero tide and current.
To carry out User calibration, power up the instrument then follow the
procedure in the User calibration flow diagram.
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