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Bruce Hamilton raised an excellent point in the "Plotting Tools"
thread:

> I always like the fact that you are always calculating drift for
> aircraft

which is correct (and apparently not normally done in marine navigation
- leeway, set and drift apparently being corrected whenever a fix is
taken).

Which reminded me of something that I've been meaning to ask - I've
noticed that in marine navigation textbooks DR lines are usually
labeled as being a "course" (i.e. TC 210, MC 150) - either true or
magnetic,  depending on personal preference.

But isn't what we're really plotting a heading? I think of a "course"
as being the path that a vessel tracks over the ground (or over the
bottom), and heading as the direction a vessel is pointed or steered in
order to produce that course.

Maybe "estimated course" (or maybe "course with no leeway/set/drift/
correction) would be a better choice for it? Or maybe it's just a
matter of semantics (and/or tradition)?

I guess it really doesn't matter as long as everyone agrees on exactly
what we're talking about, but I was curious about the ambiguity and
thought I'd ask those who might be more familiar with the terminology.

--
GregR



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