4.19 Interference
With respect to electrical and electromagnetic interference, night vision equipment should meet the requirements of resolutions A.694(17) and A.813(19) and IEC 60945
4.20 Power supply
The power supply of night vision equipment should meet the requirements of resolution A.694(17) and IEC60945.
4.21 Installation
Full installation instructions to meet the following requirements should be included in the manual.
The controls of night vision equipment should be installed in the workstation for navigating and manoeuvring, within easy reach of the navigator.
The observation distance from the monitor should not exceed 2.3 times the monitor diagonal.
The sensor of the night vision equipment should be installed in such a way that:
- the required horizontal field of view is free of obstructions;
- further within the horizontal panning area of the sensor, in the sector up to 112.5° to either side, there are no obstructions with a deepest shadow bigger than 3°;
- two deepest shadows are separated by an unobstructed field of vision of at least 30°;
- in a sector from 112.5°to minimally 175°, and from minimally 185°to 247.5°, deepest shadows are kept to a minimum;
- in the required field of view, in the direction right ahead, visibility of the water surface for the vertically tilted sensor is not reduced by more than two ship's lengths by the blind angle of one's own craft.
Night vision equipment should be designed and mounted in such a way that its operation and detection functions are not impaired by head wind and/or true wind up to 100 knots and roll and/or pitch angles up to +/-10°.
Its performance data should not be impaired by vibration occurring during normal ship's operation.
4.22 Maintenance
With respect to maintenance, night vision equipment should meet therequirements of resolution A.694(17) and IEC 60945.
4.23 Interfacing
Interfaces with other radio and navigation equipment should meet IEC 61162-1. A video output for image recording should be provided.
4.24 Back up and fall back arrangements.
In the event of failure of the pan-tilt device, the sensor should be capable of being fixed in the ahead position.
4.25 Safety precautions
The safety features of night vision equipment shall meet the requirements of resolution A.694(17) and IEC 60945
