Tt Lost Alert; How To Set The Tt Lost Filter - Furuno FAR-2228-NXT Operator's Manual

3. TARGET TRACKING (TT)
3.8

TT Lost Alert

Targets not detected in nine consecutive scans become “lost targets”. A lost target is
shown in the display with a flashing red " ". Flashing stops after the lost alert is ac-
knowledged. Further, the alert box shows the "TT TARGET LOST" alert in orange
characters and the audible alert sounds. The symbol disappears when the alert is ac-
knowledged.
If you are in an area where tracked targets are lost frequently, you may want to disable
the lost target against tracked targets by maximum range.
3.8.1

How to set the TT lost filter

You can set the lost alert to sound against lost targets that are within a specific range.
To set the criteria, use the procedure below.
1. Open the menu.
2. Select [5 TT•AIS].
3. Select [6 TT].
4. Select [7 TT LOST TGT FILTER].
5. Select [2 MAX RANGE].
6. Select [ON]. The settings can now be adjusted.
7. Spin the scrollwheel to adjust the setting as re-
quired, then left-click to apply the setting.
8. Close the menu.
Note: Reference targets are not affected by this filter.
3.8.2 How to enable/disable the lost alert
The [LOST TARGET] box, located at the bottom-right corner of the screen, enables
and disables the lost alert.
Select the box with the cursor, then left-click to cycle through the settings in the follow-
ing order: [OFF]
• [OFF]: Disable the alert. [OFF] indication is shown in yellow. [OFF] indication is
shown in yellow.
• [FILT]: Enable the alert for all lost targets, excluding filtered targets. If [2 MAX
RANGE] on the [TT LOST TGT FILTER] menu is set to [ON] or some menu item on
the [AIS LOST FILTER] menu (see section 4.12.1) is set to [ON], [FILT] indication
changes to yellow.
• [ALL]: Enable the alert for all lost targets, including filtered targets.
Note: The [LOST TGT] setting is shared commonly between TT and AIS.
3-8
[FILT] [ALL] [OFF]...