Network Computing Devices JRC 1500 MKII - Manual (Page 37)

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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
false alarming.
Press the JOYSTICK to display the menu sheet.
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
dotted line.
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.
Next, move the cursor to the desired
guard zone Width point of your Guards
zone then press the JOYSTICK con-
trol.
It displays the distance help line of the
dotted line which is new at this time.
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.
To turn the GUARD function Off,
select the GUARD-OFF on the Menu
sheet.
OPERATION
THE DISTANCE
HELP LINE
CURSOR
THE AZIMUTH
HELP LINE
START POINT (cf. )
CURSOR
START
POINT
THE NEW
DISTANCE
HELP LINE
GUARD ZONE WIDTH (cf. )
END
POINT
END POINT (cf. )
START
POINT