4. AIS OPERATION
4-13
4.11 ROT Setting
You can set the lower limit of the ROT (Rate Of Turn) at which the heading line on
target symbols will point in direction which the vessel is turning.
ROT display
1. Open the [MAIN MENU].
2. Select [TT•AIS], then push the ADJUST knob.
3. Select [TT•AIS SYMBOL], then push the ADJUST knob.
4. Select [AIS ROT TAG LIMIT], then push the ADJUST knob. The settings can now
be adjusted.
5. Using the ADJUST knob, adjust the ROT as appropriate. Rotate the ADJUST
knob to adjust the value, push the ADJUST knob to move to the next digit. The
setting range is 000.0°/min to 720.0°/min.
6. Close the menu.
4.12 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 191 "AIS COLLISION". After the alert
is acknowledged the target symbol is displayed in red color.
4.12.1 How to set the CPA and TCPA ranges
CPA and TCPA ranges can be adjusted from
the appropriate indication in the [TT•AIS]
box. If the CPA/TCPA settings are displayed
as “OFF”, place the cursor on the CPA limit
indication, then press the left button.
1. Place the cursor on the indication you wish to adjust.
Ship turning
to starboard
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 COLLISON”
appears. Press the ALERT 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
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