Sperry Marine Visionmaster FT ECDIS User Manual page 256

Navigation Tools
4. From the Bearing Type drop down arrow select between Relative
and True. When True is selected the parallel cursor is azimuth
stabilised (i.e. maintains a constant orientation with respect to
north). When Relative is selected the parallel cursor is unstabilised
(i.e. maintains a constant orientation with respect to ship's
heading). When True is selected and the heading becomes invalid
the parallel cursor is not displayed.
5. To rotate the parallel cursor either click on one of the four semi-
circular markers, hold down the left key and move the trackball left
or right to change bearing.
Or:
5. Click in the Bearing field, the text becomes green (editable). Move
the trackball left or right to change the bearing degree, the parallel
cursors move dependent on the values entered.
6. To realign the parallel cursor along ship's heading click on the
Reset to Ship Heading button.
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ECDIS User Guide
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