Furuno FCR-28x9 Manual De Usuario

4.  AIS OPERATION

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.)

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.

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.