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CANCEL key until all plot symbols and marks disappear in about 3 seconds.
Setting CPA/TCPA Alarm Ranges
When the predicted CPA of any target becomes smaller than a preset CPA alarm range and its
predicted TCPA less than a preset TCPA alarm limit, the EPA releases an aural alarm and
displays the warning label COLLISION on the screen. In addition, the EPA symbol changes
to a triangle and flashes together with its vector.
Provided that this feature is used correctly, it will help prevent the risk of collision by alerting
you to threatening targets. It is important that GAIN, A/C SEA, A/C RAIN and other radar
controls are properly adjusted.
CPA/TCPA alarm ranges must be set up properly taking into consideration the size, tonnage,
speed, turning performance and other characteristics of own ship.
CAUTION
CPA/TCPA
The CPA/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.
To set the CPA/TCPA alarm ranges:
1. Press the PLOT MENU key to show the EPA menu.
2. Press the [2] key to select COLLISION ALARM ON. At this point, a highlight cursor
appears at the "CPA x.x NM" field.
3. Enter the CPA alarm range in nautical miles (0.0 to 9.9 nm) without omitting leading
zeroes, if any, and press the ENTER key. The highlight cursor now moves to the "TCPA
xx.x MIN" field.
4. Enter the TCPA alarm limit in minutes (1.0 to 99.9 min) without omitting leading zeroes, if
any, and press the ENTER key.
5. Press the PLOT MENU key to close the menu.