And I'm still curious where the 90m comes from. True, there is one light under the nose so 6 lights = 90m; BUT, it also says that, for most of us mortals, you need 125m or takeoff minima. So, if you can count 6 lights, and assume one under the nose, to achieve 125m there need to be 3 lights out of sight, i.e 9 lights. All very confusing. I have read such a document which states minima 125m = 6 lights = 90m visual segment, but there was no explanation to square up this baffling arithmetic.