THE MARITIME SAFETY COMMITTEE,
RECALLING Article (28(b) of the Convention on the International Maritime Organization
concerning the functions of the Committee,
ALSO resolution A.886(21), by which the Assembly resolved that the function of adopting
performance standards and technical specifications, as well as amendments thereto shall
be performed by the Maritime Safety Committee and/or the Marine Environment Protection
Committee, as appropriate, on behalf of the Organization,
RECOGNIZING that, many operational bridge-related marine accidents could
be averted if an effective and operational bridge navigational watch alarm system
(BNWAS) was fitted to vessels,
that, by the use of a Bridge Navigational Watch Alarm System (BNWAS) warnings will be
given in case of the incapacity of the watchkeeping officer due to accident, sickness or
in the event of a security breach, e.g. piracy and/or hijacking,
NOTING that the installation of such equipment is a relatively low-cost
and an effective means of avoiding operational navigational accidents,
RECOGNIZING the need to prepare appropriate performance standards
HAVING CONSIDERED the recommendation on
the performance standards for BNWASs made by the Sub-Committee on Safety of Navigation
at its forty-seventh session,
1. ADOPTS the
Recommendation on Performance Standards for a Bridge Navigational Watch Alarm System,
set out in the Annex to the present resolution;
2. RECOMMENDS Governments to ensure that BNWASs installed on or after 1 July
2003, conform to performance standards not inferior to those specified in the Annex to
the present resolution.
Annex Recommendation on performance standards for a bridge anvigational watch alarm system (BNWAS)
The purpose of a bridge navigational watch alarm system
(BNWAS) is to monitor bridge activity and detect operator disability which could
lead to marine accidents. The system monitors the awareness of the Officer of 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. This purpose is
achieved by a series of indications and alarms to alert first the OOW and, if he is
not responding, then to alert the Master or another qualified OOW. Additionally, the
BNWAS may provide the OOW with a means of calling for immediate assistance if
required. The BNWAS should be operational whenever the ship.s heading or track
control system is engaged, unless inhibited by the Master.
- IMO resolution A.830(19) Code on alarms and indicators - IMO
MSC/Circ.982 Guidelines on Ergonomic Criteria for Bridge Equipment and Layout - IMO
resolution A.694(17) General Requirements1 for shipborne radio equipment
forming part of the Global Maritime Distress and Safety System (GMDSS) and for
Electronic Navigational Aids
1 IEC Publication 60945
Bridge - Wheelhouse and bridge wings
4 Operational requirements
4.1.1 Operational modes
220.127.116.11 The BNWAS should incorporate
the following operational modes:
(Automatically brought into operation whenever the ship.s heading or track control
system is activated and inhibited when this system is not activated)
- Manual ON (In operation constantly)
- Manual OFF (Does not operate under any
4.1.2 Operational sequence
of indications and alarms
18.104.22.168 Once operational, the alarm
system should remain dormant for a period of between 3 and 12 min (Td).
22.214.171.124 At the end of this dormant
period, the alarm system should initiate a visual indication on the bridge.
126.96.36.199 If not reset, the BNWAS should
additionally sound a first stage audible alarm on the bridge 15 s after the visual
indication is initiated.
188.8.131.52 If not
reset, the BNWAS should additionally sound a second stage remote audible alarm in
the back-up officer.s and/or Master.s location 15 s after the first stage audible
alarm is initiated.
184.108.40.206 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.
220.127.116.11 In vessels other than passenger vessels, the second
or third stage remote audible alarms may sound in all the above locations at the
same time. If the second stage audible alarm is sounded in this way, the third
stage alarm may be omitted.
larger vessels, the delay between the second and third stage alarms may be set to
a longer value on installation, up to a maximum of 3 min, to allow sufficient time
for the back-up officer and/or Master to reach the bridge.
4.1.3 Reset function
18.104.22.168 It should not be possible to
initiate the reset function or cancel any audible alarm from any device, equipment
or system not physically located in areas of the bridge providing proper look out.
22.214.171.124 The reset function should, by
a single operator action, cancel the visual indication and all audible alarms and
initiate a further dormant period. If the reset function is activated before the
end of the dormant period, the period should be re-initiated to run for its full
duration from the time of the reset.
126.96.36.199 To initiate the reset function, an input representing a single
operator action by the OOW is required. This input may be generated by reset
devices forming an integral part of the BNWAS or by external inputs from other
equipment capable of registering physical activity and mental alertness of the
188.8.131.52 A continuous activation of
any reset device should not prolong the dormant period or cause a suppression of
the sequence of indications and alarms.
4.1.4 Emergency call facility
Means may be provided on the bridge to
immediately activate the second, and subsequently third, stage remote audible
alarms by means of an "Emergency Call" push button or similar.
The alarm system should be capable of achieving the timings
stated in section 4.1.2 with an accuracy of 5% or 5 s, whichever is less, under
all environmental conditions.
The means of selecting the Operational Mode and the duration
of the Dormant Period (Td) should be security protected so that access to these
controls should be restricted to the Master only.
4.4 Malfunctions, alarms and indications
If a malfunction of, or power supply failure
to, the BNWAS is detected, this should be indicated. Means shall be provided to
allow the repeat of this indication on a central alarm panel if fitted.
5 Ergonomic criteria
5.1 Operational controls
5.1.1 A protected means of
selecting the operational mode of the BNWAS.
5.1.2 A protected means of selecting the duration of the dormant period
of the BNWAS.
5.1.3 A means of
activating the .Emergency Call. function if this facility is incorporated within
5.1.4 Reset facilities Means
of activating the reset function should only be available in positions on the
bridge giving proper look out and preferably adjacent to visual indications. 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.
5.2 Presentation of information
5.2.1 Operational mode
The operational mode of the equipment should
be indicated to the OOW.
The visual indication initiated at the end of
the dormant period should take the form of a flashing indication. Flashing
indications should be visible from all operational positions on the bridge where
the OOW may reasonably be expected to be stationed. The colour of the
indication(s) should be chosen so as not to impair night vision and dimming
facilities (although not to extinction) should be incorporated.
5.2.3 First stage bridge audible alarm
The first stage audible alarm which sounds on
the bridge at the end of the visual indication period should have its own
characteristic tone or modulation intended to alert, but not to startle, the OOW.
This alarm should be audible from all operational positions on the bridge where
the OOW may reasonably be expected to be stationed. This function may be
engineered using one or more sounding devices. Tone/modulation characteristics and
volume level should be selectable during commissioning of the system.
5.2.4 Second and third stage remote audible
The remote audible alarm which sounds in the
locations of the Master, officers and further crew members capable of taking
corrective action at the end of the bridge audible alarm period should be easily
identifiable by its sound and should indicate urgency. The volume of this alarm
should be sufficient for it to be heard throughout the locations above and to wake
2 IMO Resolution A.830(19)
6 Design and installation
The equipment should comply with IMO resolutions
A.694(17), A.813(19), their associated international standards3 and MSC/Circ.982
regarding Guidelines for Ergonomic Criteria for Bridge Equipment and Layout.
6.2 Specific requirements
6.2.1 System physical integrity
All items of equipment forming part of the BNWAS
should be tamper-proof so that no member of the crew may interfere with the system.s
6.2.2 Reset devices
Reset devices should be designed and installed
so as to minimise the possibility of their operation by any means other than
activation by the OOW. Reset devices should all be of a uniform design and should be
illuminated for identification at night.
6.2.3 Alternative reset arrangements may be incorporated to initiate the
reset function from other equipment on the bridge capable of registering operator
actions in positions giving proper look out.
6.3 Power supply
The BNWAS should be powered from the ship.s main
power supply. The malfunction indication, and all elements of the Emergency Call
facility, if incorporated, should be powered from a battery maintained supply.
3 IEC Publication 60945
Inputs should be available for additional reset
devices or for connection to bridge equipment capable of generating a reset signal
by contacts, equivalent circuits or serial data.47.2 Outputs
Output(s) should be available for connection of
additional bridge visual indications and audible alarms and remote audible
4 IEC Publication 61162