How To Clear Lost Targets; Cpa/Tcpa Alarm - Furuno TZTL12F Operator's Manual

6. RADAR
6.25.8

How to clear lost targets

Tracking of a target cannot be continued when the echo from that target becomes lost.
A lost target can be tracked after it is reacquired. Lost targets can be erased individu-
ally or collectively.
Individual target
Tap the target to display the pop-up menu, then tap [Clear] to remove the target from
the screen.
Clear all targets
Open the [Layers] menu, tap [ARPA], then tap [Clear Lost] to delete all lost targets
from the screen.
6.25.9

CPA/TCPA alarm

This alarm helps you keep your ship away from collision by warning of targets on a
collision course. The ARPA continuously monitors the predicted range at the Closest
Point of Approach (CPA) and predicted time to CPA (TCPA) of each tracked target.
When both the predicted CPA and TCPA are less than their set values, the target sym-
bol turns red, the alarm sounds and the flashing message "CPA/TCPA Alarm" appears
at the top of the screen.
The CPA or TCPA value can be set for "0", however, the one with the value greater
than "0" triggers the audiovisual alarm. For example, if the CPA is set for 0 NM and
the TCPA for 3 minutes, the audiovisual alarm is released when the TCPA of the target
is under 3 minutes.
CPA/TCPA alarm ranges must be set correctly according to the size, tonnage, speed,
turning performance and other characteristics of your ship.
How to set the CPA/TCPA alarm
1. Open the home screen, then tap [Settings] - [Targets].
2. Turn on [CPA/TCPA Alarm].
3. Tap [CPA Alarm Value] or [TCPA Alarm Value] to display the software keyboard.
4. Set the value, then tap  to confirm.
5. Tap the close button to finish.
How to acknowledge the CPA/TCPA alarm
The CPA/TCPA alarm sounds when the CPA and TCPA of an ARPA target are within
the CPA/TCPA alarm range. The alarm indication "CPA/TCPA Alarm" appears and
flashes at the top of the screen. To acknowledge the alarm and stop the audio alarm
and flashing of the indication, tap the indication "CPA/TCPA Alarm" (see
paragraph 2.10.8). (The ARPA vector must be displayed at least 30 seconds to calcu-
late CPA and TCPA.)
How to deactivate the CPA/TCPA alarm
1. Open the home screen, then tap [Settings] - [Targets].
2. Turn off [CPA/TCPA Alarm].
3. Tap the close button to finish.
6-30