Ais Symbol Color; Ais Lost Targets; How To Enable, Disable The Ais Lost Target Alarm - Furuno FCR-21x9-BB Operator's Manual

4. AIS OPERATION
4.10

AIS Symbol Color

1. Right-click the AIS mode indication then click [Symbol Menu] to show that menu.
2. Select [1 SYMBOL COLOR] and desired color. (Red and yellow are not available
with the IMO type.)
4.11

AIS Lost Targets

An AIS target is declared a lost target when it fails to produce data for
intervals which are based on the table on page 4-1. When this occurs,
the target is marked with the lost target symbol (flashing), shown in
the right figure, the buzzer sounds (for activated targets only) and the
Alert 537 "AIS Lost" appears.
To acknowledge a lost target, push the ALARM ACK key or click the [Alert] box.
Note 1: If a TT lost target mark is displayed when the ALARM ACK key is pushed (or
the [Alert] box is clicked) to acknowledge an AIS lost target, the TT lost target will also
be erased.
Note 2: The AIS data transmission interval depends on target's speed. For example,
the data is transmitted every 10 seconds on the ship speed of 0 to 14 kn and every
two seconds on the ship speed of more than 23 knots. For details, see the owner's
manual of the AIS transponder.
4.11.1

How to enable, disable the AIS lost target alarm

The Lost TGT indication (at the bottom-right position)
enables, disables the lost target alarm. Click the indica-
tion to select [OFF], [ALL] or [FILT] as appropriate.
OFF: Disable the lost target alarm.
ALL: Get the alarm against all lost targets.
FILT: Get the alarm against the targets whose criteria
meet the settings made in section 4.11.2.
Note: The [Lost TGT] setting is shared commonly between TT and AIS.
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