Furuno FAR-21 7-BB Series, Operator'S Manual

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1. RADAR OPERATION
1-40
Note 1: If you wish to create a target alarm zone having a 360-degree coverage
around own ship, set point “B” in almost the same direction as point “A.”
Note 2: Two target alarm zones may be set. Note however that the 2
nd
target
alarm zone is available only when the 1
st
target alarm zone is active.
Note 3: When the target alarm zone is not within the range in use the indication
UP RNG appears to the right of the ALARM box. In this case choose a
range which will display the target alarm zone.
1.24.2 Acknowledging the target alarm
A target in the target alarm zone produces both visual (flashing) and audible
(beep) alarms. To silence the audible alarm, press the [ALARM ACK] key on the
full keyboard or choose the appropriate ALARM box and then push the left
button. The ALARM box shows “ALARMx ACK.” This will deactivate the audible
alarm but will not stop the flashing of the offending target. To reactivate the
audible alarm, press the [ALARM ACK] key again or choose the ALARM box and
then push the left button. (When an external buzzer is connected, the audible
alarm does not stop until the alarm zone itself is deactivated.) The ALARM box
shows “ALARMx WORK.”
1.24.3 Deactivating a target alarm
1. Roll the trackball to choose the ALARM1 or ALARM2 box, whichever alarm
you wish to deactivate.
2. Push the left button until the alarm status in the ALARM box disappears. In
the IMO-type radar deactivation of the target alarm zone 1 deactivates target
alarm zone 2. Target alarm zones 1 and 2 work independent on the Non-IMO
radar.