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CAUTION
CPA/TCPA Alarm
The CPA and TCPA alarm feature should never be relied upon as the sole means for
detecting the risk of collision.
The navigator is not relieved of the responsibility to keep visual lookout for avoiding collisions,
whether or not the radar or other plotting aid is in use.
To set the CPA/TCPA alarm ranges:
1. Press the PLOT MENU key to show the ARPA 1 menu.
2. Press the [8] key to select menu item COLLISION ALARM. At this point, a highlight
cursor appears at the "CPA x.x NM" field.
3. Enter the CPA alarm range in nautical miles (0.0 to 9.9 nm) without omitting leading
zeroes, if any, and press the ENTER key. The highlight cursor now moves to the "TCPA
xx.x MIN" field.
4. Enter the TCPA alarm limit in minutes (1.0 to 99.9 min) without omitting leading zeroes, if
any, and press the ENTER key.
5. Press the PLOT MENU key to close the menu.
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 CANCEL key.
2.14 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.