Sperry Marine Visionmaster FT ECDIS, Руководство пользователя

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ECDIS User Guide Basic Operation of ECDIS
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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
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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 heading line is initially drawn
vertically and then changes dependent on the current heading
bearing (this mode is not available when using raster charts, see
North Uniformity
•
In certain presentation modes / conditions, north cannot be
displayed as uniform. When this occurs uniformity is then
calculated from the centre of the displayed screen and the term "at
centre" will appear beneath the north arrow. The following
presentation modes / conditions will trigger this -
When in Polar Stereographic Projection
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The position of the heading line and beam line within own ship's outline symbol is dependent
on the distance values applied to the CCRP in the Configuration tool (see Chapter 1
Configuration in Volume 2 of the VMFT Ship's Manual). To position the CCRP in the centre of
the ship's outline the distance from bow must be half the configured value for ship's length. If
no value is applied, the heading and beam line will appear at the bow of ship's outline symbol.