ECDIS-E User Guide
Navigation Tools
65934012
5-21
Line Of Position
The geographic location of own ship can be determined by using Lines of
Position (LOP), which are created by taking bearings and/or radar
measurements from own ship to suitable objects. Visual bearings taken on
fixed aids to navigation or landmarks such as smokestacks or towers are
typically used for bearing LOPs, while the distance to a distinct shoreline or
point of land measured by radar may be used for a range LOP. When two
or more LOPs are created a fix of own ship’s position may be obtained.
The active point used for calculating the LOP fix
will be a circle for bearing objects and a triangle
for range objects. A triangle inside a circle will be
shown if both range and bearing are measured to
the same object.
The Line Of Position window is divided into two
main areas. The upper part LOP Data provides a
Enhanced Position Entry control which allows
user selection of range/bearing for object
location. This can be either from querying the
chart for point objects or by manually selecting an
area of the chart.
For each operator defined LOP position, an
active point symbol will be displayed. Each
symbol will have a reference number i.e. LOP 1, LOP 2 etc. When the
range or bearing data is entered, the time of entry is indicated beside the
symbol. The symbol remains fixed at the selected location or charted
object, but the time stamp moves with the line or circle, based on the speed
and course of the vessel.
Up to six LOPs may be drawn on the chart display, note that LOP reference
numbers in the LOP window may be greater than six depending on their
creation methods.
Summary of Contents for VISIONMASTER FT ECDIS-E
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