4.17 Durability and resistance to environmental conditions
Night vision equipment should withstand the environmental conditions specified in resolution A.694(17) and in IEC 60945.
4.18 Electrical and electromagnetic 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.
4.19 Power supply
The power supply of night vision equipment should meet the requirements of resolution A.694(17) and IEC 60945.
4.20 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:
a) the required horizontal panning area is free of obstructions in the sector up to 30｡?o either side;
b) 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.
4.21 Maintenance
With respect to maintenance, night vision equipment should meet the requirements of resolution A.694(17) and IEC 60945. When the manufacturer requires maintenance at specific periods, an operating hours meter should be provided.
4.22 Interfacing
Interfaces with other radio and navigation equipment should meet IEC 61162. A recognized international standard video output for image recording should be provided.
