Sperry Marine VISIONMASTER FT ECDIS-E, Руководство пользователя

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Basic Operation of ECDIS-E ECDIS-E User Guide
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Heading Line, Beam Line and Stern Line
The Heading Line (HL) and Stern Line (SL) are lines drawn parallel to the
ship’s fore/aft axis indicating the current own ship heading (HL) or the
reciprocal of the current own ship heading (SL). The HL and SL begin at
the CCRP of own ship and are drawn to the edge of the chart display. The
Beam Line is drawn perpendicular to the HL and SL at the CCRP.
The HL is always displayed. The SL may be selected for display, in addition
to the HL, from the Display Settings in the NAV Tools menu. The SL is
shown as a dotted line.
The figure below shows own ship with HL and SL displayed.
The bearing of the HL or SL is dependent on the presentation mode.

In Course Up (C UP) mode the lines are initially drawn vertically
and then change dependant on the current heading bearing (this
mode is not available when using raster charts, see Presentation
Mode dictated by Raster Charts).

In North Up (N UP) mode the lines are drawn at the current
compass heading.
When own ship is off-centred, the heading line bearing is automatically
adjusted so that the scale is always referenced correctly.
For further information on how the presentation mode affects own ship's
heading line, see Presentation Modes.
Beam Line
The beam line is a short line drawn at right angles to the heading line and
extending to each side of own ship's CCRP, the default (minimum) length is
10mm.
The beam line length can be increased from the 10mm default from the
Display Settings sub-menu in the NAV Tools menu.