Alert; Lost Target; Collision Alert (Cpa, Tcpa) - Furuno FAR-1416 Operator's Manual

3. TARGET TRACKING (TT)
3.10

Alert

3.10.1

Lost target

Targets not detected in five consecutive scans become "lost targets". A lost target is
shown in the display with a flashing red "X". Flashing stops after lost target alert is ac-
knowledged.
If you are in an area where tracked targets are lost frequently, you may want to disable
the lost target alert against tracked targets, by maximum range or minimum speed.
How to set the lost target filter
You can set the lost target alert to sound against lost targets that are within a specific
range. To set the criteria, use the procedure below.
1. Open the [MAIN MENU].
2. Select [ALERT SETTINGS], then press the left button.
3. Select [TT/AIS ALERT], then press the left button.
4. Select [TT LOST ALERT], then press the left button.
5. Select [ON], then press the left button.
The cursor moves to [ALERT RANGE].
6. Rotate the scrollwheel to adjust the setting as required, then press the left but-
ton to apply the setting.
7. Close the menu.
Note: Reference targets are not affected by this filter.
How to enable/disable the lost target alert
The [LOST TARGET ALERT] box at the bottom right corner enables and disables the
lost target alert. Select the box with the cursor, then press the left button to select
[OFF], [ALL] or [FILT] as appropriate.
• [OFF]: Disable the alert.
• [ALL]: Enable the alert for all lost targets, including filtered targets.
• [FILT]: Enable the alert for all lost targets, excluding filtered targets.
3.10.2

Collision alert (CPA, TCPA)

This radar calculates CPA and TCPA by using own ship and relative target positions.
The TT continuously monitors the pre-
dicted range at the Closest Point of Ap-
proach (CPA) and predicted time to
CPA (TCPA) of each TT. When the pre-
dicted CPA of any TT becomes smaller
than a preset CPA range and its predict-
ed TCPA less than a preset TCPA limit,
the audio alarm sounds and TT COLLI-
3-12
CAUTION
CPA/TCPA Alarm
The CPA and 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.