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All the talk about differences in terminology between sailors and flyers
reminded me of a couple other funny things pilots do (myself included). Most
pilots flying around the states plotting their "courses" on aeronautical charts
are plotting rhumb lines on Mercator projections. Pilots, for the most part
aren't taught to distinguish between rhumb line courses and great circle
courses. The funny thing is, they generally follow radio navigation devices that
guide airplanes over great circle courses. Good marine navigators, of course,
know that a radio bearing to a distant non-directional radio beacon is the
initial bearing of the great circle track to that aid, and plot it accordingly.
These day few pilots worry about errors of that magnitude and draw radio
bearings as straight lines on Mercator charts. Once upon a time however, flight
navigators were men with navigational skill to be reckoned with. Those of you
that are pilots might be interested to review the requirements for the flight
navigator certificate.(Appendix A of Part 63). Here's a
link:http://www.access.gpo.gov/nara/cfr/cfrhtml_00/Title_14/14cfr63_00.html

Chuck


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