Furuno FMD-811 - Manual (Page 21)

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3) Select Alarm Mode to IN or OUT.
4) Press the [ENT] key followed by the
[MENU] key.
Dashed line:
no alarm
IN ALARM OUT ALARM
Guard
zone
Figure 1-12 In and out alarms
Setting the guard zone
1) Mentally create the guard zone you want
to display. See Figure 1-13 (1).
2) Operate the cursor pad to set cursor on
top (bottom) left edge of the guard zone.
Press the [GUARD] key. *G (IN) (or G
OUT)), with asterisk blinking, appears at
the top right-hand corner on the display.
(The asterisk indicates the guard zone is
partially set.) See Figure 1-13 (2).
3) Operate the cursor pad to set cursor on
bottom (top) right edge of the guard zone
and press the [GUARD] key. The aster-
isk disappears. See Figure 1-13 (3).
4) Guard zone appears on the display. See
Figure 1-13 (4).
Silencing the audible alarm
Any ships, landmasses, etc. coming into (or
going out of) the guard zone will trigger the
audible alarm and display the guard zone in
reverse video. You can silence the alarm by
pressing the [GUARD] key. When this is
done, G (ACKN) replaces G (IN) (or G
(OUT)).
Press the [GUARD] key again to reactivate
the alarm. G (IN) (or G (OUT)) replaces G
(ACKN).
Canceling the guard zone
Press and hold down the [GUARD] key until
the guard zone disappears.
Notes on the guard alarm
• When the radar range is less than one half
of the guard zone range, the guard zone
disappears from the display and UP
RANGE appears. If this happens, raise
the range to redisplay the guard zone.
• A target echo does not always mean a
landmass, reef, ships or surface objects
but can imply returns from sea surface or
precipitation. As the level of these returns
varies with environment, the operator
should properly adjust the STC, gain (sen-
sitivity), A/C RAIN and A/C AUTO to
be sure the alarm system does not over-
look target echoes.
Guard zone
to set * G (IN)
(2) Drag cursor to
top left corner of
zone and press
[GUARD].
Asterisk blinking
Drag cursor
here.
(1) Mentally create
the guard zone to set.
G (IN)
(3) Drag cursor to
bottom right corner
of zone and press
[GUARD]. (4) Guard zone
completed.
G (IN)
Guard
zone
Drag cursor
here.
Figure 1-13 How to set a guard zone