Systems Ltd
Bridge Navigational Watch
Alarm System type NT990 BNWAS

Fully compliant with IMO Resolution MSC.128(75), IEC 62616 (2010) and MED Wheelmarked with futher Classification Society Type Approvals from RMRS, CCS, KR, CR and USCG, the Navitron NT990 BNWAS can be supplied as a basic system to operate proprietary alarm units (where appropiate) or, as an expanded system complete with alarm selector switch and individual officer cabin and crew call audible alarm units etc.

In either case, the NT990 BNWAS provides a safety monitor requiring regular acknowledgement (Reset) by the duty watch personnel at time intervals between 3 and 12 minutes which can be specified and set by the master or OOW as considered appropriate.

Click for a larger image of the NT990BNWAS

Model NT990 BNWAS
Bridge Navigational Watch
Alarm Display Unit


The chosen time interval (3 - 12 mins) is security protected by means of key switch selection as is the operating mode which may be set: -

  Permanently ON
Permanently OFF
AUTO mode (automatically activated by power up of other equipment such as Autopilot / Track Control system etc)

Once activated, completion of the specified timeout period (3 - 12 mins) will automatically generate a Bridge visual alarm (15 secs) followed by a Bridge audible alarm (15 secs) which is tone and volume adjustable during installation.

Alarm cancellation and commencement of a new timing period will occur whenever the BNWAS 'Reset' button is operated on the main unit or when other Wheelhouse / Bridge located Resets (or optional Movement Detectors) are activated.

Failure to 'Reset' the system during the 30 second Bridge visual / audible alarm period will result in automatic 'Officer Call' alarm activation which, in an expanded system, can be routed to the appropriate duty officer cabin alarm unit. If the officer call alarm stage is not acknowledged within a selectable 90 sec to 3 minute period, a final stage Crew Call will automatically be generated.

In the event of a sudden crisis situation requiring immediate Officer assistance, the NT990 BNWAS also features an 'Emergency Call' facility which may be operated at any stage of the timing cycles.

Further built in security and error management provisions include 'Tamper' and 'Power Fail' alarm indications fully commensurate with MSC.128(75) and IEC 62616.

The NT990 BNWAS is suitable for vessels of all types and tonnages and can be supplied for both 115 / 230 VAC (DB2) and 24 Vdc (DB1) power supply applications.

BNWAS Basic Configurations (DC only and AC/DC)

BNWAS Expanded System Configuration (DC only and AC/DC)

Technical Specifications

Outline & Mounting Dimensions

NT990 BNWAS (Expanded System) Leaflet download (PDF) az

NT990 BNWAS Manual download (PDF)

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