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Great circle formulae, True cource and actual heading
Hi,
I am trying to write a formula to compute flight headings. If i use 2 lat/lon i can get a "true course" but due to magnetic variations the true course is not really all that useful, (knowing that my true course is 118deg will not tell me that i should fly 93 deg). What i mean is if i go from A to B i can calculate the True course, ('tc') but my actual heading varies a lot depending on my position along the course. Is there a reliable formula to calculate my actual heading at a certain point along the course? Many thanks in advance. Sims |
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