Furuno GD-1700, Руководство оператора

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3. RADAR OPERATION
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3.12 Erasing the Heading Line, North Marker
The heading line indicates the ship's heading in all presentation modes. It 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 in the north-up, course-up and true motion modes with ship’s
movement.
The north marker appears as a short dashed line. In the head-up and course-up
modes the north marker moves around the bearing scale as the ship’s heading
moves.
To temporarily erase the heading line and north marker, press the RADAR
DISPLY soft key followed by the HL OFF soft key. Release the key to redisplay
the markers. (If the radar soft keys are not shown, hit the [HIDE/SHOW] key to
display them.)
3.13 Reducing Noise
Noise, appearing on the displays as random “speckles,” can be reduced as
follows:
1. Press the [MENU] key to open the menu.
2. Press the RADAR DISPLAY SETUP soft key.
3. Select NOISE REJECTION, then press the EDIT soft key.
4. Select OFF, LOW or HIGH as appropriate.
5. Press the ENTER soft key or the [ENTER] knob.
6. Press the [MENU] key to close the menu.