Quote:
Originally Posted by complutum
I think that your problem is your making circle radious with own speed by factor instead of use this value for circle diameter. in your example with own speed 12 knots he circle radious must be 60km that means 120km diameter.
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No no, definitely not diameter. The edge of the circle represents the collection of courses at the defined own speed. It has to be the radius that must correspond to the speed. The target speed being 12 or 120, while the contact speed is (assumed) 6 or 60, thus halve of it, is entirely coincidence.