Sperry Marine Visionmaster FT ECDIS, User Manual

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ECDIS User Guide Navigation Tools
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b. To change from True bearing to Relative bearing, click the T
button, the button toggles between T (true) and R (relative).
c. Select range by ticking the Range box. When Range is selected
screen displays a circular magenta line centred on the LOP and a
time stamp. Click in the field and define the required range, the
range circle is re-drawn to the distance in NM entered. Range line
moves across the display, based on the vessel speed and course.
d. A Time read-only text box is displayed as part of the LOP Data
group. This displays the time, in the format HH:MM:SS, of the last
update of Range or Bearing.
4. The point symbol will be a triangle if a bearing LOP is used, or a
circle if a range LOP is used. A triangle inside a circle will be shown
if both range and bearing are measured to the same object.
5. When the required bearing/range values
have been entered click Add LOP button.
The LOP data entered is listed in the
Lines of Position (LOPs) area of the
window and the LOP data on the screen
changes to orange.
6. Repeat the process above for the required
number of LOPs.
Note that when a LOP has been added to
the LOPs list its bearing and range values
cannot be changed. Should LOP data
need to be modified, the relevant LOP must be deleted and then
replaced using the amended data.
7. The same location or object may be used for multiple bearing
and/or range observations at different times. When this is done
each selection is added to the Lines Of Position list with the LOP
reference numbers superimposed over each other.
8. To delete a LOP the click the Delete button. The LOP is removed
from the display and the LOPs list, note that the numbers
previously assigned to LOPs are retained.
9. To delete all LOPs from system click Clear button. All LOPs are
removed from the display and Line Of Position window. A
permanent fix symbol remains on the display after the Clear button
has been clicked.
10. When all data is entered for the desired number of LOPs click
Accept Fix to establish a LOP.