Ais Collision Alarm (Cpa, Tcpa); How To Set The Cpa And Tcpa Ranges - Furuno FAR-2228-NXT Operator's Manual

4. AIS OPERATION
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 "CPA/TCPA". After the alert is ac-
knowledged the target symbol is displayed in red color.
Note: Only AIS targets (class A and B AIS targets and SAR vessels) are subject to the
CPA/TCPA alarm.
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
CPA
TCPA
4-20
Method
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 incre-
ments thereafter
Left-click 1, 2, 3, 4, 5, 6, 12, 15 (minutes)
Scrollwheel 1 to 60 minutes in 1-minute increments
Settings options