Hi muhammed.
the issue is about angles around a circle and how they show direction of
travel. I'm not sure how much geometry in maths you've done yet, but the
basic idea is very simple.
Imagine a circle like a clock face, but instead of numbers 1-12, you have
360 degrees spaced around the circle. By saying turnt to such and such a
degree, you dictate how much about the circle someone turns, hence the
expression a 180 degree turn, which is half of 360, ie, turning around and
facing the opposite way.
the problem is in zero sight where the zero point of the circle is. In the
true cartesian mathematical method as Tom said, zero is on the eastern side
of the circle where the three would be on a clock, so in Zero sight you'd
need to turn your plane to angle 90 degrees to go north.
however, most people here are used to the system lone wolf has and the
system used by the military, where zero is held to be north, thus
corresponding to where the 12 would be on a clock.
that's personally the method I prefer, 0 at north, 90 east, 180 south and
270 west, for navigating in real time i find that makes a good bit more
sense, even though in maths that's not what you'd draw.
I hope this explains the debate successfully.
Beware the grue!
Dark.
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