Cpa/Tcpa Alarm - Furuno 1835 Operator's Manual

3. ARPA OPERATION
3.9

CPA/TCPA Alarm

Set CPA (Closest Point of Approach) alarm range and TCPA (predicted Time to CPA)
alarm time to alert you to targets that can be on a collision course. When CPA and
TCPA of any ARPA target become less than the preset CPA and TCPA alarm settings,
the audio alarm sounds. The alarm message "COLLISION" appears. The target sym-
bol changes to a dangerous target symbol (triangle) and flashes with its vector. You
can stop the audio alarm with any key. The flashing of the triangle stops when the
tracked ARPA target is not in the CPA and TCPA alarm setting. The ARPA continu-
ously monitors CPA and TCPA of all tracked ARPA targets.
This feature helps identify targets that can be on a collision course. Correctly adjust
GAIN, A/C SEA, A/C RAIN and other radar controls.
1. Press the MENU key to open the menu.
2. Use the Cursorpad (S or T) to select [Target] and press the ENTER key.
3. Use the Cursorpad (S or T) to select [CPA] and press the ENTER key.
4. Use the Cursorpad (S or T) to select CPA distance and press the ENTER key.
3-8
Dangerous target symbol
CAUTION CAUTION
Do not depend on the CPA/TCPA alarm
as the only method to detect the risk of
collision. The navigator is not released
of the responsibility to keep visual caution
for collision situations, whether or not the
radar or other plotting aid is in use.
CPA options