Furuno FAR-2107(-BB) - Manual (Page 81)

1. RADAR OPERATION
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1.34 Markers
1.34.1 Heading line
The heading line is a line from the own ship position to the outer edge of the
radar display area and appears at zero degrees on the bearing scale in head-up
mode; it changes the orientation depending on the ship orientation in north-up
and true motion modes.
Temporarily erasing the heading line
To temporarily extinguish the heading line to look at targets existing dead
ahead of own ship, press the [HL OFF] key on the keyboard, or use the
trackball to select the HL OFF box at the bottom left corner of the display then
push the left button. In addition to the heading line, the stern marker and all
graphics within the effective display are also erased. To redisplay the heading
line, etc., release the key or the left button.
1.34.2 Stern marker
The stern marker, which is a dot-and-dash line, appears opposite to the heading
line. To display or erase this marker do the following:
1. Left-click the MENU box to open the MAIN menu.
2. Select MARK to show the MARK menu.
3. Select 3 STERN MARK.
4. Select OFF or ON as appropriate.
5. Push the right button twice to close the menu.
1.34.3 North marker
The north marker appears as a short dashed line. In the head-up mode, the
north marker moves around the bearing scale in accordance with the compass
signal.