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The Bridge Navigational Watch Alarm System (hereinafter referred to as BNWAS) is a system used to prevent marine accidents that can occur from sleepiness or lack of night bridge navigators.

BNWAS follows IMO Resolution MSC 128 (75) to set certain time. If reset input by the night bridge navigator does not occur within the time setting or motion is not detected by the motion sensor installed in the bridge, smooth navigation is maintained by sending out visual display and auditory alarm.

BNWAS has become mandatory for all ships since July 2011. By applying the NMEA0183 network protocol (electrical interface and data protocol for communications between marine instrumentation) standardized by IEC 61162-1, information is smoothly shared with existing ship equipment to receive alarm input signals from bridge equipment on top of simple bridge alarms. The alarm is sent out through the alarm devices in the cabins of backup night navigator and captain to prevent marine accidents.