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Navigation Tools ECDIS-E User Guide
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Creating LOPs
Click on NAV Tools in the main menu and then select Line Of Position
from the list.
To create one or more LOPs, do the following:
There is one of two ways to generate a LOP, described below:
1. Click in the Latitude/Longitude (LAT/LON)
fields, a drop down location keypad appears
from where you can select the object
position in a number of ways described below:
a. Query - Select an existing mariner object
on the display for the object position
b. Offset - Select a range and bearing value
from the current cursor position for the
object position.
c. From Chart - Move the cursor to the
location on the display and click at the
desired position.
d. Ownship - Select to position the object at
the current location of ownship.
e. Enter a manual LAT/LON location using the numerical keypad.
2. Or, right click on the display at the desired
LOP reference point and select Add Line of
Position (LOP) in the semi-transparent
context menu that appears. The Line Of
Position menu will show the LAT/LON of the
selected location with the Bearing and Range
values set to 0.0.
3. All LOPs default to true bearing at 0.00° . To change from Bearing
to range click the Range radio button. The range defaults to 0.00
NM. A bearing angle and/or a distance range can be entered for
the LOP, as described below:
a. Select a bearing by ticking the Bearing check box. When
Bearing is selected the screen displays a vertical magenta line
from the LOP circle and a time stamp. Click in the field and
define the required bearing angle, the bearing line is re-drawn
to the angle entered. The bearing line moves across the
display, based on the speed and course of the vessel.
b. To change from True bearing to Relative bearing, click the T
button, the button toggles between T (true) and R (relative).