Sperry Marine Visionmaster FT ECDIS, User Manual

Page: 352 / 531

Routes ECDIS User Guide
8-18 65900012
Approaching Leg
The Approaching Leg area enables you to edit the following attributes of
the leg approaching the selected waypoint:
•
Rhumb Line
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or Great Circle
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•
Leg Speed - estimate average speed for the route leg (maximum
speed 99 kn.)
•
XTD Limits - the distance in metres that the ship can stray from the
route leg’s track line before an off track error alarm occurs.
Different values may be entered for the Port and Starboard side of
the route leg's track line.
The following leg attributes are read-only which automatically change if the
route data is changed:
•
Leg Distance - the leg distance between each waypoint.
•
Leg Bearing - the bearing of the leg in degrees.
To edit the Approaching Leg data do the following:
1. To change the leg speed or off track limit click in the relevant field,
the text changes to green (editable). Move the trackball left or right
to change the values.
2. To change the departing or approaching leg from Rhumb Line to
Great Circle click on the drop down arrow to the right of the field
and make the desired selection.
3. To change the XTD limits click in the PORT or STBD field , the text
changes to green (editable). Move the trackball left or right to
change the values and left click to accept. The values defined will
only apply to that leg.
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A line on a sphere that cuts all meridians at the same angle; the path taken by a ship or
plane that maintains a constant compass direction.
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A circle drawn around the Earth such that the centre of the circle is at the centre of the
Earth. Following such a circle plots the shortest distance between any two points on the
surface of the Earth.