11. AIS OPERATIONS
11-7
4. Select [ON].
5. Select [ALARM RANGE].
6. Press the numeric keys to set the alarm range (setting range: 0.1 to 99.9 NM).
7. Press the
DISP
key to close the menu.
11.5.3
How to set the 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. The settings are
applied to TT targets. When CPA and TCPA of any AIS or TT target become less than
the preset CPA and TCPA alarm settings, the audio alarm sounds. The target symbol
changes to a dangerous target symbol (AIS: changed to red).
Note:
CPA and TCPA ranges must be set up properly taking into consideration the
size, tonnage, speed, turning performance and other characteristics of own ship.
1. Press the
MENU
key to open the main menu.
2. Select [6. ALARM SETTINGS].
3. Select [CPA/TCPA ALARM] on page 2.
4. Select [ON].
5. Select [CPA ALARM RANGE].
6. Press the numeric keys to set the alarm range (setting range: 0.1 to 99.9 NM).
7. Select [TCPA ALARM RANGE].
8. Press the numeric keys to set the alarm time (setting range: 30S. to 99M.59S.).
9. Press the
DISP
key to close the menu.
11.5.4
How to set the lost alarm
AIS targets not detected within the time specified become “lost targets”. Set the time
as follows.
1. Press the
MENU
key to open the main menu.
2. Select [6. ALARM SETTINGS].
3. Select [AIS LOST ALARM] on page 2.
4. Select [ON].
5. Select [LOST DEL. TIME].
6. Press the numeric keys to set the alarm time (setting range: 3 to 999S.).
7. Press the
DISP
key to close the menu.
CAUTION
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.
