Furuno FAR-2107(-BB) - Manual (Page 147)

3. TARGET TRACKING (TT)
3-9
[TT LOST ALM FILTER]
1 BACK
2 MAX
RANGE
OFF/ON
0NM
3 MIN SHIP SPEED
OFF/ON
0.0kn
3.7 Lost Target
Targets not detected in five consecutive scans become "lost targets." A lost
target is shown in the display with flashing red "X". Flashing stops after lost
target alarm is acknowledged.
If you are in an area where tracked targets are lost frequently you may want to
disable the lost target alarm against tracked targets by maximum range or
minimum speed.
3.7.1 Setting the lost target filter
You can set the lost target alarm to sound against lost TTs that are within a
specific range or ship speed. Set the criteria as below.
1. Left-click the MENU box to open the menu.
2. Select 4 [TT
.
AIS] to open the TT
.
AIS menu.
3. Select 9 [TT LOST FILTER].
4. Set items 2 and 3 as appropriate, referring to the description below.
MAX RANGE: Any TT lost targets beyond this range will not trigger the
lost target alarm.
MIN SHIP SPEED: Any TT lost targets slower than this setting will not trigger
the lost target alarm.
5. Push the right button several times to close the menu.
Note: Reference targets are not affected by this filter.
3.7.2 Enabling, disabling the lost target alarm
The LOST TARGET ALARM box at the bottom right corner enables and disables
the lost target alarm. Select OFF, ALL or FILT as appropriate.
OFF: Disable the alarm
ALL: Get the alarm against all lost targets.
FILT: Get the alarm against the targets whose
criteria meet the settings on the TT LOST
ALM FILTER menu.
LOST TARGET ALAEM OFF
LOST TARGET box