4.14 SETTING GUARD
The guard zone alarm is effective for alerting the operator to targets approach-
ing his own ship. An alarm is sounded when any (apparent) target returning an
echo above the noise threshold is detected. If sea clutter, or other incidental
echoes trip the alarm, adjust the gain control and/or the sea clutter to avoid this
① Press the JOYSTICK to display the menu sheet.
② Select GUARD-ON and press the JOYSTICK. The radar display returns to
the normal video presentation.
Corsor appears on the PPI screen and shows the distance and the azimuth of
the Maker. It displays the distance help line and the azimuth help line of the
③ Move the cursor to the desired guard
zone start point using the JOYSTICK
and then press the JOYSTICK again.
The distance help line and the azimuth
help line of the dotted line are displayed
in the fixation in the start point posi-
tion at this time.
④ Next, move the cursor to the desired
guard zone Width point of your Guards
zone then press the JOYSTICK con-
It displays the distance help line of the
dotted line which is new at this time.
⑤ Next, move the cursor to the desired
end point of your guard zone then press
the JOYSTICK control. A ring in the
distance range is displayed by the solid
line at this time.
⑥ To turn the GUARD function Off,
select the GUARD-OFF on the Menu
START POINT (cf.
GUARD ZONE WIDTH (cf.
END POINT (cf.