5.5.1
Movement of Controls
Movement of a control forward, clockwise to the right, or up,
should:
- turn the equipment or component on, or
- cause the quantity to increase, or
- move the equipment or component forward, clockwise, to the right,
or up.
5.5.2
Corresponding Movements
Controls should be selected so that the direction of movement
of the control will be consistent with the related movement of an
equipment component, or vessel. The direction of motion of operating
elements for manoeuvring equipment should correspond with the direction
of the effect on the ship caused by the installations controlled.
5.5.3
Return to Navigation
Monitoring Mode
When a single device is used simultaneously for voyage planning
and navigation monitoring it should be possible to revert to the monitoring
mode with a single operator action.
5.5.4
Minimal User Actions
Control actions should be simple, particularly for real-time
tasks requiring fast user response; control logic should permit completion
of a transaction sequence with the minimum number of actions.
5.5.5
Consistency of Control
Actions
The same functions should be activated on devices by the same
control actions, as far as practicable.
5.5.6
Feedback
Visual, auditory or mechanical feedback should be provided to
indicate that a controller input has been registered.
5.5.7
Operation of Controls
Controls should be easy to identify and operate.
5.5.8
Accessibility of Controls
for Important Functions
The controls for the most important and/or frequently used functions
should be easily visible and accessible to the user from the normal
working position.
5.5.9
Operation of Controls
for Important Functions
The controls for the most important and/or frequently used functions
should require only a single actuation to accomplish their function.
5.5.10
Assignment of Controls
of Important Functions
The controls for the most important and/or frequently used functions
should be assigned to only one function.
5.5.11
Accidental Input or
Actuation Prevention
The system should be designed to prevent the accidental manipulation
of controls, e.g. physical protection, which could result in changes
to the status of the system, the system functions, components, or
data, e.g. loss of power.