Section 4 Range and Bearing Measurement Methods  4-6 
 
4.3.2.2  Setting a reference point 
Set a reference point by selecting the icon at the top right corner of the top screen. 
 
The following table shows the setting items. 
From Own Ship  Own ship is used as the reference point. 
 
From Ref. Mark1 to 20  Select one of the reference points 1 to 20 that were 
specified arbitrarily. 
This item can be selected only when arbitrary 
reference points have been created. 
This item cannot be selected if the latitude/longitude 
of own ship or ship’s heading of own ship is invalid. 
 
Edit Ref. Mark...  Displays the arbitrary reference point edit screen. 
For the details, “Editing/deleting an arbitrary 
reference point” described below. 
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Editing/deleting an arbitrary reference point 
A  reference  point can be added by selecting [Add Reference Mark] (addition of a measurement 
reference point) from the context menu or by directly inputting the latitude and longitude on the [Edit 
Reference Mark] screen. 
A reference point can be added, edited, or deleted on the [Edit Reference Mark] screen. 
[Operation procedure] 
Perform the following menu operation to open the [Edit Reference Mark] screen. 
[Menu] button → Tools → Edit Reference Mark 
 
No.  Select No. to be added, edited, or deleted. 
Only the items that are allowed to be added, edited, or deleted can be selected. 
LAT/LON  Input the latitude/longitude of the arbitrary reference point. 
When an input of a latitude is confirmed, input of a longitude is enabled. When an 
input of longitude is confirmed, the inputs of the latitude and longitude are 
Deletes the selected item. This item is enabled only when any No. is selected.