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15. Navigation Sensors
2-27
2.21 Markers
Heading marker and heading line
The heading marker and the heading line indicate the ship's heading in all presentation modes. 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 its orientation depending on the ship orientation in north-up and true motion
modes. The heading marker is a small circle on the bearing scale to indicate the heading.
Temporarily erasing the heading line
To temporarily extinguish the heading line to look at targets existing dead ahead of own ship, push the HL OFF key
on the control unit w/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.
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. Use the trackball to select the MENU box at the right side of the display then push
the left button to display the Main menu.
2. Spin the scrollwheel to select Mark then push the scrollwheel.
3. Use the trackball to select the setting of Stern Mark.
4. Spin the scrollwheel to select Off or On as appropriate then push the scrollwheel.
5. Click the Close window button (X) on the menu to close the menu.
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.
Own ship symbol
The own ship symbol marks own position on the display. It can be turned on or off and its configuration selected
from the General page of the Symbol Display dialog box. Two configurations are available: minimized symbol and
scaled symbol. The scaled symbol is scaled to indicate the length and beam of the vessel. If the beam width or
length of the symbol (set at installation) gets smaller than 6 mm, the symbol will disappear and own ship will be
with a minimized symbol. Ship’s dimensions should be entered at installation to use the scaled ship symbol.
Scaled symbol
Minimized symbol
Heading line
Beam line
X
Antenna
position
Heading line
Beam line
1. Use the trackball to select the Symbol DISP box at the right side of the display then push the left button.
2. Select the General page.
3. Use the trackball to select the setting of Ship outlines.
4. Spin the scrollwheel to select Off or On as appropriate then push the scrollwheel.
5. Use the trackball to select the setting of Own ship limit.
6. Spin the scrollwheel to select Beam width or Length as appropriate then push the scrollwheel.
7. Click the Close window button (X) to close the menu.