Tt Lost Target Alarm; How To Enable, Disable The Tt Lost Target Alarm; How To Set The Tt Lost Target Filter - Furuno FCR-21x9-BB Operator's Manual

3. TARGET TRACKING (TT)
3.13

TT Lost Target Alarm

Tracked targets not detected in five consecutive scans become "lost targets." When
this occurs;
• A red X is put on the TT symbol (flashing) of the lost target. (The flashing stops after
the lost target alarm is acknowledged.)
• The audio alarm sounds and the Alert 527 "Lost Target Alarm" appears in the [Alert]
box.
3.13.1

How to enable, disable the TT lost target alarm

The [Lost TGT] indication at the bottom-right position enables, disables the lost target
alarm. Click the indication to select [OFF], [ALL] or [FILT] as appropriate.
ALL: Get the alarm against all lost targets.
OFF: Disable the alarm.
FILT: Get the alarm against the targets whose criteria meet the settings made in
section 3.13.2.
Note: The [Lost TGT] setting is shared commonly between TT and AIS.
3.13.2

How to set the TT lost target filter

If you are in an area where tracked targets are lost fre-
quently, you may want to disable the lost target alarm
against certain tracked targets, by maximum range or
minimum speed.
1. Right-click the TT mode indication then select [TT
Menu] to show that menu.
2. Select [3 LOST FILTER MAX RNG].
3. Spin the scrollwheel to select [ON]. Select the
range setting then spin the scrollwheel to set the
range. Any TT lost targets beyond this range will
not trigger the TT lost target alarm.
4. Select [4 LOST FILTER MIN SPD].
5. Spin the scrollwheel to select [ON]. Select the
speed setting then spin the scrollwheel to set the
speed. Any TT lost targets slower than this setting
will not trigger the TT lost target alarm.
6. Close the menu.
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