Introduction of Bridge Navigational Watch Alarm System:
The purpose of a bridge navigational watch alarm system ( HABJ0001 BNWAS ) is to monitor bridge activity
and detect operator disability which could lead to marine accidents. The system monitors the awareness of the
Officer of the Watch ( 00W) and automatically alerts the Master or another qualified 00W if for any reason the 00W
becomes incapable of performing the 00W’ s duties. This purpose is achieved by a series of indications and alarms
to alert first the 00W and, if he is not responding, then to alert the Master or another qualified 00W. Additionally,
the BNWAS may provide the 00W with a means of calling for immediate assistance if required. The BNWAS should
be operational whenever the ship’s heading or track control system is engaged, unless inhibited by the Master.
This system meets the requirements of MSC. 128 (75),IEC62616(2010) and can be used in any kind of ship.
BNWAS Mandatory Installation Requirements
The SOLAS amendment V/19 requires all kinds of ships to be equipped the BNWAS by stages as follows:
System Composition:
Technical specifications:
● Power Supply： 220/110VAC 24VDC
● Extension alarm level： 75dB(A)～120dB(A)
● alarm sequence： 0.5s to connect; 0.5s to cut off
System Basic Functions:
Set Functions
● Select "AUTO" and "ON" and "OFF" three working mode
● Adjust dormant, 3 ~ 12mins adjustable
● Adjust the interval between alarm level 2 and 3, 1.5 ~ 3mins adjustable
Alarm Functions 
● Alarm Level 0 (15s)
● Alarm Level 1 (15s)
● Alarm Level 2 (1.5～3mins)
● Alarm Level 3
● Alarm Response
● Power Outage Alarm and Silence
● Fuse Fail Alarm
Call and Response Functions Reset Function
● Shif and Response Auto Power Source Switch Function
● Call and Response Dimmer Function
