5.2.5 Pan and tilt ranges of the fields of view
The axis of the field of view should be capable of being moved at least 175° horizontally to either side and minimally 10°downward and 10°upward.
5.2.6 Pan and tilt speeds of the fields of view
By activation of a control element, the axis of the field of view should be capable of being returned automatically to the ahead position at a minimum angular speed of 30°/s.
5.2.7 Heading indication
When inside the field of view, the heading of the craft should be indicated by a marker on the display with a maximum error not greater than +/- 1 degree.
A visual indication of relative bearing with a maximum error of +/- 1 degree should be provided when panning.
5.2.8 Roll or pitch
The performance of the night vision equipment should be such that when the craft is rolling and/or pitching up to +/- 10 degrees the performance requirements in this standard should be complied with.
5.2.9 Clear view
Arrangement should be provided to ensure efficient cleaning of the sensor head/lens from the operating position.
5.2.10 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.
5.3 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;
- operating hours counter.
