The purpose of a bridge navigational watch alarm system is to monitor the bridge activity and detect

operator disability which could lead to marine accidents. The system monitors awareness of the Watch

officer and automatically alerts the Master or another qualified person if for any reason watch officer

becomes incapable of performing watch officer’s duties. This purpose is achieved by series of indications

and alarm to alert first the watch officer and, if he is not responding, then to alert Master or another

qualified person. Additionally, the BNWAS provide the watch officer with means of calling for immediate

assistance if required. BNWAS must operate whenever heading or track control system is interlocking

unless prohibited by the captain.