JRC JAN-701B -, Instruction Manual

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3 Basic Operation of ECDIS 3-125
ECDIS
3.20 Cross Bearing
This function displays cross bearings. An angle for calculating the own ship’s position from the
reference point can be obtained. If a position fixing sensor such as a GPS navigation system has
encountered an error causing the own ship’s position to be obscure, the own ship’s position can be
obtained by drawing a visually observed fixed target’s bearing on the chart using the cross bearing
function.
1) In the normal menu
Select [MENU] - [(7) Main] - [(2) Cross Bearing] in that order.
In the Table Editing menu, Graphic Editing menu
Select [MENU] - [(6) Main] - [(2) Cross Bearing] in that order.
In the User Chart Editing menu
Select [MENU] - [(5) Main] - [(2) Cross Bearing] in that order.
The “Cross Bearing”dialog box opens and the mouse cursor changes.
2) Sets the reference point
By the trackball operation
Rotate the trackball to move the cursor to the reference coordinates of the cross bearing line,
and left-click. Alternatively, enter the reference position values in the Latitude and
Longitude fields in the [Cross Bearing] dialog box.
By the [Cross Bearing] panel operation
It inputs value to the [LAT] and [LON] numerical box.
Reference coordinates of the cross bearing
line
Reciprocal bearing from the reference point
Bearing from the reference point
Length of the cross bearing line
Selection of bearing display on the chart
(True/Reverse)