
4. AIS OPERATION
4-18
4.14
AIS Collision Alarm (CPA, TCPA)
This radar calculates CPA and TCPA by using own ship and relative target positions.
An AIS dangerous target is one whose CPA and TCPA are within the range of the CPA
and TCPA limits set in the TT/AIS box. The AIS symbol of an AIS dangerous target is
red and flashing, and is announced with the Alert "AIS DANGER OF COLLISION". Af-
ter the alert is acknowledged the target symbol is displayed in red color.
4.14.1
How to set the CPA and TCPA ranges
CPA and TCPA ranges can be adjusted from the ap-
propriate indication in the [TT] box.
1. Left-click the [CPA/TCPA] indication to activate
the feature.
2. Place the cursor on the indication you wish to
adjust.
3. Left-click, or spin the scrollwheel, to adjust the settings as required. The settings
options are outlined in the table below.
Indication
Method
Settings options
CPA
Left-click
0.5, 1.0, 1.5, 2.0, 3.0, 4.0, 5.0, 6.0 (NM)
Scrollwheel
0.1 to 20; 0 to 10 in 0.1 NM increments, 1 NM increments thereafter
TCPA
Left-click
1, 2, 3, 4, 5, 6, 12, 15 (minutes)
Scrollwheel
1 to 60 minutes in 1-minute increments
Thicker than
activated target
When a sleeping or an activated target violates the CPA/TCPA
alarm setting its symbol changes to the dangerous target
symbol (red and flashing) and the message “AIS DANGER OF
COLLISON” appears. Press the
ALARM ACK
key (or click the
[ALERT] box with the left button) to acknowledge the
CPA/TCPA alarm. The audible alarm is silenced and the
symbol stops flashing.
Take appropriate action to avoid collision.
Dangerous target
CPA setting
TCPA setting
Left-click here to activate
CPA/TCPA settings.
Содержание FAR-2218
Страница 132: ...1 OPERATIONAL OVERVIEW 1 110 This page is intentionally left blank ...
Страница 176: ...3 TARGET TRACKING TT 3 36 This page is intentionally left blank ...
Страница 202: ...4 AIS OPERATION 4 26 This page is intentionally left blank ...
Страница 232: ...5 VIDEO PLOTTER OPERATION 5 30 This page is intentionally left blank ...
Страница 294: ......