Hi Egg.
Many thanks. You're spot on.
The bearings act as helicopter main routes (HMR). The ones you see arrowed in the jpg are inbound (to Aberdeen). They are interlaced with the outbound HMRs (more visible on the .xar file). So the separation is 3 degrees between out and inbound routes. Not sure why 3 was the amount chosen - that was decided a long time ago. Probably they took a proper aeronautical chart and played around with a protractor and a ruler until they came up with a "spacing" that looked workable.
Hope you got to sleep eventually ;-)
Great variety of styles and subjects this month.
Frank
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