Hi Peter
Regards your single light query, can I suggest very carefully!
In our auto hover 76s, it was easy. Fly over the top and push a button and it all happened for you. But as someone said it must be very rare to find a rig or ship with only one effective light. In this case you need to have a plan with a fixed set of figures based on ground speed, height, rate of decent and distance to target based on either GPS, DME or more usually radar. If you get current at this, it is quite easy but do it once in a while and it gets a bit frightening.
Glad I don't have to do it anymore! The Chinese think I am too old!
