Raytheon Pathfinder ECDIS Operator's Manual page 250

8.2.1.4 Navigating with Great Circle or Rhumb Line
ECDIS provides a feature that allows you to navigate great circle routes. When
you enter a waypoint at a distance greater than 200 NM from the ship's position
or from the previous waypoint (see chapter 8.2.1.2), ECDIS prompts you with
following message:
Simulate a Great Circle Route
If you want to simulate a great circle route, you will need to enter the number of
intermediate points to create the route (see Figure: 1−15) . These points create
a curved great circle route. You can delete or move these waypoints at your
choice. If you click on No, ECDIS will simply draw a rhumb line route to the
waypoint.
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select an new datum waypoint coordinates
Step 3
Figure: 1−13 Edit Route Dialog Box
Figure: 1−14 Great Circle Route dialog box
Step 4
8−22
Step 8
specify the number
of intermediate waypoints
press Cancel to undo the
last waypoint entries.
Edition: 30.MAR.2007