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Turning past position display on/off
The plots the latest five past positions of a plot-
ted target by dots. You can show or hide the dots.
1) Press the MENU key.
2) Select the PLOT menu.
3) Press the ENTER/SELECT key.
4) Select TRACK and press the ENTER/SE-
LECT key.
5) Select ON (or OFF).
6) Press the ENTER/SELECT key.
7) Press the MENU key.
Canceling target plotting
Canceling individual target plotting
Place the cursor on the plot symbol and press the
CLEAR/DELETE key.
Canceling all target plotting
1) Press the MENU key.
2) Select the PLOT menu.
3) Press the ENTER/SELECT key.
4) Select ERASE and press the ENTER/SELECT
key.
5) Press the MENU key.
1.27 Setting a Guard Alarm
Zone
The guard allows the operator to set the desired
range and bearing for a guard zone. When ships,
islands, landmasses, etc. violate the guard zone
an aural alarm sounds and the offending target
blinks to call the operator's attention. Two areas
can be set, zone 1 (short dashed line) and zone 2
(long dashed line), and one may be active.
CAUTION
• The alarm should not be relied upon as
the sole means for detecting possible
collision situations.
• A/C SEA, A/C RAIN and GAIN controls
should be properly adjusted to be sure the
alarm system does not overlook target
echoes.
Selecting guard zone type
The guard alarm can be set to sound when a tar-
get either enters (or exits) the guard zone. You
can select which type of guard alarm you want to
use through the GUARD menu.
In alarm: The alarm sounds on targets entering
the guard zone. (IN) appears at the top right-hand
corner when the In alarm is selected.
Out alarm: The alarm sounds on targets exiting
the guard zone. (OUT) appears at the top
right-hand corner when the Out alarm is selected.
Dashed line:
no alarm
IN ALARM
Figure 1-23 In and out alarms
Guard
zone
OUT ALARM
1 – 21
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