Centralised control and monitoring requires a workstation design approach. At the main operating position on the bridge, referred to variously as the workstation for navigation and traffic surveillance/manoeuvring, the navigation workstation or the conning position, the OOW should be able to undertake all his primary duties unassisted with efficiency and safety.
The design should also allow two bridge team members to work unhindered side by side.
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Bridge design and the layout of the workstations, together with the equipment and instrumentation at those workstations, is an important part of IBS design. There should be proper access into and around the bridge, a good working environment and adequate bridge visibility from all the workstations.
A detailed review of the principles of IBS design is outside the scope of this Guide but the design should ensure that the failure of one sub-system does not cause the failure of another, and that any failure is immediately brought to the attention oftheOOW.
To permit centralised monitoring and control of navigational functions on the bridge, the following systems will be required:
220.127.116.11 Navigation management system
The navigation management system provides the mechanism for planning, executing and monitoring the passage plan and will therefore provide the link between the charts on which the voyage has been planned, the position-fixing systems, the log and gyro and the autopilot.
An electronic chart display system will typically function as the navigation management system within an IBS, supported by a dedicated route planning terminal to allow route planning activities to be undertaken while on passage and without interfering with the OOW.
18.104.22.168 Alarm system
The IBS has an alarm system to warn the OOW if potentially dangerous situations could arise. Failure of the OOW to acknowledge alarms - usually within 30 seconds - will transfer the alarm to remote alarm units in cabins, offices and messes to call for back-up assistance.
The main navigational sensors, in particular the radar which provides traffic alarms, the gyro and autopilot which provide course-related alarms, and the position-fixing systems which provide position-related alarms, need to be connected to the alarm system. ECDIS, the steering gear, power distribution panels etc. may also be connected.
Included in the alarm system should be a watch safety or fitness alarm to monitor the alertness of the OOW. An interval timer for setting alarm intervals of up to 12 minutes should be part of the system. A number of alarm acknowledgement points, each with a pre-warning alarm to give the OOW notice that the alarm is about to be activated should be available around the bridge. As with the failure of the OOW to acknowledge a navigation alarm, if the fitness time interval expires, an alarm should sound away from the bridge.
22.214.171.124 Conning display
The display should be available at the conning position to show information summaries of the important navigational sensors used on passage and while docking.
The display also provides the OOW with a central place to monitor sensors and compare actual settings with those ordered.