Raytheon Pathfinder ECDIS Operator's Manual page 292

Line Of Position
9.1.6
The Lines Of Position (LOP) feature is provided as an aid to the Navigator
(terrestrial navigation):
S To determine ship's location when forced to operate in the Dead Reckoning
S As a visual check of the Ship's electronic positioning systems.
This feature is implemented to emulate the functionality and symbols used on
paper charts.
Procedure: (e.g. LOP Type Linear)
Step 1 Select Line Of Position from the Nav Tools menu.
Step 2 Select LOP Type Linear
Step 3 Place the Cursor over the selected Nav Aid and press [Enter].
Step 4 Enter the sighted bearing (see Status BarCursor or Bearing Compass)
Step 5 Repeat this process for as many Nav Aids as desired.
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Operator Manual
mode (DR)
This feature is implemented to emulate the functionality and symbols used
on paper charts.
The dialog box appears.
The Latitude / Longitude values will appear in the Reference Position
boxes.
click on the ACCEPT button
The LOP Line appears with the Set Time of the line.
Observe the LOPs' point of intersection to determine Own Ship's
position.
9−10
Edition: 30.MAR.2007