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1. HOW THE BRIDGE ALARM SYSTEM OPERATES
1-2
Bridge alarm sequence
1.2 Watch Safety Alarm
The main purpose of the watch safety alarm is to monitor bridge activity on the ship
that uses a “one-man bridge”. The system looks for the operation of equipment within
the selected time interval (3-12 minutes). The OOW validates operator fitness on the
bridge with the WATCH/RESET button on the Timer Reset Panel or any operation on
the Bridge Panel. The system also acknowledges the presence of the OOW if some
equipment connected to the BR-1000 (radar, ECDIS, etc.) is operated. The watch
safety alarm has four stages, one a prewarning stage.
• Prewarning: If the OOW does not validate operator fitness within the selected time
interval, a lamp on the Bridge Panel flashes (in red) and a lamp on the Timer Reset
Panel flashes (in yellow) for 15 seconds.
• 1st stage: If the OOW does not validate operator fitness in the prewarning stage,
the lamps flash an additional 15 seconds and a 15-second audible alarm sounds.
• 2nd stage: If the OOW does not validate operator fitness at the 1st stage, the alarm
is sent to the Cabin Panel in the living quarters of the selected back-up officer and
all the Cabin Panels fitted in public areas. These Cabin Panels give visual (illumi-
nated lamp) and audible (buzzer) alarms.
• 3rd stage: If the OOW does not validate operator fitness within the selected time
interval (90-180 s), the Cabin Panel in the living quarters of all navigation officers
and all the Cabin Panels fitted in public areas give audible and visual alarms (illumi-
nated lamp).
Reason
removed
Pending
BUZZER STOP
ACK
NO BUZZER STOP
NO ACK
Alarm forwarded
External equipment
generates an alarm
1st stage
Visual ALM*
+ Audible ALM
Visual ALM (lighting)
+ Audible ALM
Visual ALM (lighting)
+ Audible ALM
Visual ALM (lighting)
+ Audible ALM
2nd stage
3rd stage
30 s
Visual ALM* + Audible ALM
NO BUZZER STOP
NO ACK
Alarm forwarded
Variable (90-180 s)
BRIDGE PANEL
TIMER RESET PANEL
(incl. watertight type)
Back-up navigation officer quarters
and all public areas
CABIN PANEL
CABIN PANEL in all
navigation officers quarters
(The CABIN PANELS in all public areas
continue the alarm.)
*Red flashing at Bridge Panel, Timer Reset Panel
Visual ALM*
+ Audible ALM