4.11 Interference
The surroundings of objects commonly encountered at sea and in ports should not be displayed less clearly on the monitor of the night vision equipment because of dazzle effects, reflection, blooming, or any other effects.
4.12 MALFUNCTIONS, WARNINGS, ALARMS, AND INDICATIONS
Night vision equipment should have the following displays
- state of operation;
- visual alarm in the event of failure of the night vision equipment;
4.13 Software requirements
If certain functions of night vision equipment are implemented using software, such software should meet the applicable requirements of IEC 60945
4.14 Ergonomy
In the ergonomic design of night vision equipment, the commonly accepted ergonomic standards should be taken into account.
4.15 Controls
The number of operational controls should be limited to the minimum required for operation.
Double functions of operational controls should be avoided.
The functions of the individual operational controls should be clearly labelled.
The functions of night vision equipment should be activated directly through the operational controls; menu-driven controls should be avoided.
The operational controls should be clearly identifiable in the dark. Their brightness should be adjustable.
The operational controls of night vision equipment should meet the requirements of resolution A.694(17) as well as applicable requirements of IEC 60945.
4.16 Presentation of Information
The monitor display should be non-dazzling and non-flickering. The display should be at least 200 mm diameter.
The following information should be displayed permanently on the control panel:
- the selected field of view if more than one is provided.
4.17 Software requirements
The operational characteristics of the software should meet the following requirements in particular:
- self-descriptiveness of the functions implemented by means of software;
- display of user interface status;
- software protection against unauthorized use.
4.18 Durability and resistance to environmental conditions
Night vision equipment should withstand the environmental conditions specified in resolution A.694(17) and in IEC 60945.
