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5-18
5.13.2 Acknowledging CPA/TCPA audible alarm
Press the [AUDIO OFF] key to acknowledge and silence the CPA/TCPA aural alarm.
The warning label COLLISION and the flashing of the triangle plot symbol and vector
remain on the screen until the dangerous situation is gone or you intentionally terminate
tracking of the target by using the [TARGET CANCEL] key.
5.14 Setting a Guard Zone
When a target transits the operator-set guard zone, the buzzer sounds and the indication
GUARD turns red at the screen bottom. The target causing the warning is clearly indicated
with an inverted flashing triangle.
CAUTION
Guard Zone Alarm
The guard zone alarm should not be re-
lied upon as the sole means for detecting
possible collision situations. The opera-
tor of a ship is not relieved of the respon-
sibility to keep lookout for possible
collisions, whether or not the radar is
in use.
5.14.1 Activating the guard zone
One or two guard zones may be selected. The No. 1 guard zone is available between 3
and 6 nm and the No. 2 guard zone can be set anywhere when the No. 1 zone is already
in use.
To set and activate the guard zone:
1. Press the [PLOT MENU] key to show the ARPA 1 menu.
2. Press the [4] key to select GUARD ZONE.
3. Further press the [4] key to select (or highlight) ON to activate the guard zone.
4. Press the [ENTER] key to conclude your selection.
5. Press the [5] key to select GUARD ZONE SET. At this point the GUARD ZONE SET
menu appears.