Regulations from IMO’s Maritime Safety Committee (MSC) requires carriage of a BNWAS Bridge Navigational Watch Alarm System complying with IMO performance standards.
BNWAS minimum requirements:
To find out how many alarm units you will have to install, please see IMO rec MCS 128-75 chapter: 188.8.131.52 – 184.108.40.206
“The BNWAS should additionally sound a first stage audible alarm on the bridge 15 s after the visual indication is initiated.
If not reset, the BNWAS should additionally sound a third stage remote audible alarm at the locations of further crew members capable of taking corrective actions 90 s after the second stage remote audible alarm is initiated.”
“Means of activating the reset function should be easily accessible from the conning position, the workstation for navigating and manoeuvring, the workstation for monitoring and the bridge wings.”