STOWE MARINE DATALINE-X COMPASS, User Manual, Page: 32 / 48

Setting-Up Part 4
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4.6 True / Magnetic Headings and Bearings Selection
The displayed heading and bearings may be set to reference either Magnetic or
True North.
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 LOCK push-button three times until the LCD indicates the
current selection as (a distorted) 'MAG’ (or 'truE').
3. Select the required heading reference, either Magnetic or True, by
pressing both buttons together.
4. Return to the main display by pressing the HEADING push-button
four times to select the Calibration Mode End Screen, and then
pressing both buttons together.
4.7 Magnetic Variation Entry
As a default the Magnetic Variation compensation on the COMPASS is turned
Off, and it will only read messages that contain the correct data, either
Magnetic or True. This is the ‘safest’ setting because an incorrect Variation
setting will not give false or erratic data. However in some instances some of
the displays may not be available because the data is not in the correct format.
For instance, True Headings may be required, while the heading sensor is a
fluxgate compass giving Magnetic data, or the Waypoint Display may not be
available because the heading is Magnetic, but the only Waypoint Bearings
available are True.
Therefore the COMPASS can have the local magnetic variation entered so that
it can change incoming headings or bearings from Magnetic to True, or vice
versa.
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 LOCK button four times until the LCD indicates ' VAr?'
3. Press both buttons together to start to set the variation value, the
current value will be shown flashing. If the variation compensation
is turned Off it will show ‘ OFF’. The variation is turned off by
setting it to between -1° and +1°
4. Increase the variation value (or turn it on at +1° if it is off) using the
LOCK button.
5. Decrease the variation value (or turn it on at -1° if it is off) using the
HEADING button.