BNWAS Bridge Alarm System// Simplified Version Bridge Navigational Watch Alarm System - BNWAS

BNWAS Bridge Navigational Watch Alarm System as per IMO MSC 128(75) monitors the officer’s on the watch presence in Wheelhouse under sea going condition.

SELMA Bridge Inspector – Simplified Version is a version of BNWAS developed by SELMA for Light Crafts and small tonnage vessels with basic features:

  • Touch Screen Technology
  • PLC Control Type System
  • Autopilot NMEA 0183 / Dry Contact Auto Mode Activation
  • Heavy Duty Control Panel
  • Separate Alarm Messages

SELMA Bridge Inspector BNWAS Bridge Navigational Watch Alarm System main objective is to monitor the activity in Wheelhouse and identify any disability of operator which could cause marine accidents.

In particular BNWAS monitors the awareness of Officer on the Watch (OOW) and automatically alerts the Master or another qualified OOW if for any reason the OOW becomes incapable of performing the OOW’s duties. Consequently a sequence of warning, indications and alarms alert first the OOW and if he is not responding then alert the Master or another qualified OOW.

SELMA BNWAS Bridge Navigation Watch Alarm System

Additional the BNWAS may provide the OOW with a means of performing Emergency Calling for immediate assistance if it is demanded.

It is important to be noted that the BNWAS should be operational whenever the Ship’s Heading or Track Control System is engaged and generates valid NMEA 0183 Signal according to IEC 61162, unless inhibited by the Master.

SELMA BNWAS Bridge  Watch Alarm System
SELMA BNWAS Bridge Alarm System

For more details please visit the SELMA Bridge Inspector BNWAS site

Bridge Alarm System combines BNWAS and Bridge Alert Management System concentrating all the alarms from Navigation Instruments in Centralized Touch Screen.

SELMA Bridge Inspector BNWAS Bridge Navigational Watch Alarm System comprises of state-of-the art control and instrumentation technology with maximum performance capabilities, implementing monitoring and alarm function operation.

SELMA Bridge Inspector BNWAS comprises the following equipment:

  • Main Display Unit (Touch Screen)
  • Main PLC Panel
  • UPS/Battery Charger Panel
  • Bridge Remote Reset/Audible and Visual Alarm Stations
  • Officer’s Cabins Remote Alarm/Sounder Stations
  • Public Spaces Sounders
  • Bridge Motion Detectors (Optional)
SELMA Bridge Alarm System - Bridge Alert Management System BAMS
SELMA Bridge Alarm System - Bridge Alert Management System
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Bridge Inspector Technical Specifications

Main Display Unit TFT Touch Screen Type
Alternative 1 : Amber Monochrome
Alternative 2 : Colour (65,536 colors)
Main Processor Unit PLC (Programmable Logic Controller)
PLC Digital I/O Standard 36 (max 256)
Operation Modes (Protected) Automatic / Manual On / Manual Off
Auto Mode NMEA Speed 4,800 – 38,400 bps
NMEA 0183 Inputs 1 – 4 Serial Ports IEC 61162
Auto Mode Activation GPS/Heading Track Control IEC 61162
Speed Log Pulse Input (200 – 400 pulses)
Digital Free Contact NC / NO
Modbus PLC Ports 2
Ethernet PLC Port 1 (Optional)
Motion Sensors Ports Standard 2 (Expandable to 12)
Main Power Supply 110 – 230V AC 50 / 60Hz
Emergency Power Supply 24V DC
SELMA UPS 6 Hours independent Emergency Operation
System Configuration Security Removable Key / Password Protected (Master)
Dormant Period (Td) 3 -12 min
First Stage Warning Indication Active after Td
First Stage Alarm Td +15 sec
Second Stage Alarm Td +15 sec +15 sec
Third Stage Alarm Td +15 sec +15 sec +(90-180) sec * or omitted **
Bridge Remote Reset Stations Standard 6 (Expandable)
Watch Alarm, Emergency Call, Reset , Buzzer
Officers Cabin Station Standard 5 (Expandable)
Duty Call Lamp, Test Buzzer, Buzzer Activation
Public Spaces Sounders Standard 2 (Expandable)
Tamper Protection Separate Tamper Alarms Activation Protected
Supplementary PLC Outputs VDR, Ship General Alarm System
Optional NMEA Output $ALR, $AKN for VDR
Type Approved IMO MSC.128(75)
IEC60945 / IEC61162 / IEC62616:2010

For more details please visit the SELMA Bridge Inspector BNWAS site