Does anybody out there remember the approach technique for landing in LZs at night, called the 'Seletar Helicopter Instrument Touchdown System' - known by the inevitable abbreviation: S.H.I.T.S.
This was long before NVGs and comprised IIRC coloured lights on poles set to display a heading and angle of approach (see all the lights in a row and 'Bob's your mother's brother').
Could be quite exciting at times!
Old Duffer