STOWE MARINE DATALINE-X COMPASS, User Manual, Page: 33 / 48

Part 4 Setting-Up
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6. Press both buttons together to save the variation value.
7. Return to the main display by pressing the HEADING push-button
five times to select the Calibration Mode End Screen, and then
pressing both buttons together.
4.8 Compass Auto-Deviation Compensation
The Calibration process must be performed after installation of the system,
after any movement, additions, or removals of metal objects from the vicinity of
the sensor, and also if the vessel is moved to a latitude of more than 20° from
where the last calibration was carried out.
Calibration of the Dataline Heading sensor is controlled by the COMPASS
display, whereas calibration of the Robertson RFC250 Heading sensor is done
automatically by the sensor. Both processes are detailed below.
4.8.1 Compass Auto-Deviation Compensation - With the Dataline
Heading Sensor
In order to compensate the Dataline Heading sensor first select the auto
deviation compensation screen in the Calibration mode, and then command the
heading sensor to perform its Automatic Deviation Correction Calculation.
When the sensor has started the process the vessel should be slowly steered in
a number of circles until the sensor signals that the process has been finished.
This will normally take up to four rotations, and is best performed in good
conditions, with a calm sea.
1. Press both buttons together, and hold for more than 3 seconds, until
'rEd', 'Grn', or 'YEL' is shown on the display.
2. Press the HEADING push-button four times until the LCD shows
'HdG' and a number or letter. The number or letter indicates the
status of the heading sensor, as below:
'HdG0' = Heading sensor is Not Deviation Compensated.
'HdGc' = The Heading sensor is already Compensated.
'HdG4' = Memory Error, contact your dealer for advice.
'HdG6' = Battery Voltage is below 11 Volts.
3. If any other number is seen then this is another error, so consult
your dealer for advice.
4. If the LCD shows 'HdGc' then the heading sensor is already
compensated. However if it needs to be compensated again due to
movement of metal or magnetic objects in its vicinity then press both
buttons. The LCD will show 'Hdg', and then after a short time it