BNWAS

BNWAS (Bridge Navigational Watch Alarm System)

Model BR-500

Monitor watch officer's presence and receive early warning detections in case of an emergency

The IMO MSC.86 (May 2009) decided to make the BNWAS (Bridge Navigational Watch Alarm System) mandatory of all ships of 150 GT and larger. Passenger ships constructed on or after July 1st 2011, irrespective of size, shall be fitted with the BNWAS to be in operation when the ship is at sea. Ships constructed prior to July 1st, 2011 are also requested to install BNWAS.

Merchant Marine

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Features
About BNWAS (Bridge Navigational Watch Alarm System)
Various Equipment
Specifications
Equipment List
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Features

Compliant with IACS UR E27*.

For IACS UR E27, click here.

Meets the IMO resolution MSC.128(75) for Bridge Navigational Watch Alarm System (BNWAS), and MSC.302(87) for Bridge Alert Management

IEC62616 Ed.1 Compliant

Monitors the watch officer's presence for maritimecasualty avoidance

Transfers the watch alarm to the back-up officer, in the event that the watch officer fails to respond to watch pre-warning or watch alarm

Quick access push keys for Navigation Officer's Calland Emergency Call

Notifies Back-Up Navigators when TCS (Track ControlSystem, option) has failed

Outputs ALR sentence for VDR

Optional Motion Detector and Flash Beacon available

Set-up menu is protected by password

Mode selection (Manual OFF, Manual ON, AUTO)
Timer interval (3 to 12 min.)
System test

Easy to read alphanumeric and graphic presentations

Multilanguage available English, Japanese, Russian, Chinese and Korean

For use of languages other than English, please consult with the flag administration and/or class society concerned, before operating BNWAS in those languages.

About BNWAS (Bridge Navigational Watch Alarm System)

Structure

Dormant Period

The watch officer in the wheelhouse has to press the button on Timer Reset Panel or operate interfaced equipment at certain intervals. (Dormant period, 3-12 min.)

Prewarning

If the watch officer does not press the button on Timer Reset Panel or operate interfaced equipment, the Main Alarm Panel, the Timer Reset Panel and the Flash Beacon (optional) generate the visual alarm in 15 seconds. (Prewarning)

1st Stage

If the visual alarm is not acknowledged in the prewarning period, the Main Alarm Panel and the Timer Reset Panel generate the audible alarms as well as visual alarm in 15 seconds. (1st Stage)

2nd Stage

If the officer doesn't respond to the alarm in the 1st Stage, the BR-500 transmits the alarm to the selected back-up navigator's and/or Captain's room. (2nd Stage)

3rd stage

If the alarm is not acknowledged within the pre-set time, the system transmits the alarm to all Cabin Panels. (3rd Stage)

Dormant Period

The buzzer stops when the officer presses the [RESET] button. The Main Alarm Panel will reset the timer and return to the dormant period, when the alarm is acknowledged by the watch officer.

Watch Alarm Sequence

Timer reset function and Visual indication

The timer reset may be facilitated by one of following means:

Pressing the reset button on the Main Panel/Timer Reset Panel
Provoking the motion sensor
Initiate operation of various navigation equipment

It is important to keep in mind when planning a BNWAS installation that the external devises, which can act as reset devises, need to be located in position where proper lookout can be done by the watch officer.

For the motion sensor, it is critical to locate it in such a way that it cannot be activated by the ships movements. Thus, any curtains present on the bridge deck should not come in the way of the sensor.

For first line of alert, in accordance with IMO Res. MSC.128(75), sufficient number of visual indications (flashing lights) are to be installed and connected.

The visual indications should be visible from all operational positions within the bridge where the OOW (Officer of the Watch) may be stationed to perform his duties.

These positions are made up by, but not limited to, Conning work station, Navigation support work station, steering work station and 2 x docking work stations.

Operational modes

BNWAS should incorporate the following 3 operational modes:

Automatic:

The BNWAS is automatically activated when the vessel is navigating by means of heading or track control system (autopilot/trackpilot), and inhibited as the heading/track control system is deactivated.

Manual ON:

The BNWAS is always in operation

Manual OFF:

The BNWAS is turned off completely

Various Equipment

Main Alarm Panel
Model BR-510

Timer Reset Panel
Model BR-530（Option）

Cabin Panel
Model BR-540（Option）

Watertight Timer Reset Panel
Model BR-550（Option）

Motion Detector
Model BR-560（Option）

Flash Beacon
Model BR-570（Option）

Specifications

Product Name	BRIDGE NAVIGATIONAL WATCH ALARM SYSTEM
MAIN ALARM PANEL (BR-510)	Screen Size	4.3" color LCD
	Pixel Number	480 x 272
PROCESSOR UNIT (BR-520)	Input Port	Operational Fitness	4 ch (normal open)
		Autopilot Mode	1 ch (normal open)
		Backup Navigator	1 ch (normal close)
	Output Port	System Failure	2 ch (normal close: legacy mode or normal open: Alert I/F 1 and 2)
		Serial Signal	1 ch (IEC61162-1)
		Cabin Panel Control	12 sets max. (3 sets: parallel connection)
		Timer Reset Panel Control	6 sets max. (2 sets: parallel connection)
		Motion Detector	2 ch
		Flash Beacon	3 ch
CABIN PANEL (BR-540、Option)	Input Voltage	12 VDC: 100 mA or less (supplied from processor unit)
	Visible Indication	Alarm LED, Duty LED
	Audible Alarm	Buzzer
TIMER RESET PANEL / WATERTIGHT TIMER RESET PANEL (BR-530/BR-550、Option)	Visible Indication	Alarm LED, Reset LED
	Audible Alarm	Buzzer
	Timer Reset	Press Button
MOTION DETECTOR (BR-560、Option)	Detecting Method	Infrared Body Motion Sensor
	Distance	5 m max.
	Moving speed	0.8 m/s to 1.2 m/s
	Temperature gap	7 °C (forward)
FLASH BEACON (BR-570、Option)	Previous Visible alarm	Watch Alarm lamp (Yellow)
POWER SUPPLY (PROCESSOR UNIT)	100-230 VAC: 0.6-0.4 A, 1 phase, 50/60 Hz
	24 VDC: 1.0 A (Back-Up Source)
ENVIRONMENT	Tempreture	Watertight Timer Reset Panel	-25°C to +55°C
		Other Units	-15°C to +55°C
	Relative Humidity	93% at 40°C
	Dustproof/waterproof	Watertight Timer Reset Panel	IP56
		Processor Unit	IP22 (bulkhead), IP20 (tabletop)
		Other Units	IP22
	Vibration	IEC 60945 Ed. 4