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Is that saying the blue angle is always 60 degrees? Because if so, if you go up 50%, the red line will be horizontal, i.e. bearing is 90 degrees, and when you get to your circumference, the inside angle will be 60 degrees again, so bearing is 120 degrees.
Also, this looks like a complicated away to avoid the dog turd at bottom left.
chez_jay
Geometry:
If I know the blue angle, then if I know how far up the vertical line I've moved, can I work out the red angle (without measuring) ie if I go up 50% is the angle to the original point now 30deg?