Furuno TZTL12F Operator's Manual page 9

CPA/TCPA alarm
The CPA/TCPA alarm releases aural and visual alarms when both the CPA and TCPA of a tracked
target are equal to or lower than the CPA/TCPA alarm setting.
CPA: Closest point of approach
TCPA: Time to closest point of approach
How to set the CPA/TCPA alarm How to set the CPA/TCPA alarm
H H Home screen
OR
How to acknowledge the CPA/TCPA alarm How to acknowledge the CPA/TCPA alarm
Tap the alarm message (top of screen) to acknowledge the alarm and stop the aural alarm.
Set the alarm value, then tap [ ].
CPA/TCPA Alarm
9
ON
Tap