The sighting device consists of a tripod mounting bracket and adjustable clamps, a telescopic sight (marked with angles for field vision), a gauge to view the angle of adjustment and a spirit level to confirm the correct angle is set.
- allows for horizontal and vertical alignment.
- marked internally with vision markers and angles for ease of use.
These are required to set the light to the correct vertical setting and azimuth for light fittings on the runway.
These angles are described in ICAO (Annex 14 Appendix 2) / EASA / FAA.
Example from ICAO Annex 14 Appendix 2 for Approach Lights:
