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Subject: Re: correct way to draw LOPs
From: Rick Emerson (rick@XXX.XXX)
Date: Tue Jun 22 1999 - 09:36:57 EDT
Russell Sher writes:
> Thanks for the advice - I had always assumed an arrowhead at each end (and
> double for advanced LOP) - by the way what do you mean by 'An LOP is
> perpendicular to the bearing' ... ? Are you assuming a celestial LOP here
> (perpendicular to the azimuth?) In the case of (say) a bearing of a known
> shore object, for coastal nav. this would of course not be the case -
> right?, do you still use an arrowhead at each end in this case - with the
> LOP drawn through the object for a short distance?
[...]
As I said to Russell, my comment was a case of my fingers being faster
than my brain. Range-based LOP's are perpendicular while
bearing-based LOP's indeed lie on the bearing line (i.e., are not
perpendicular).
As to the question of arrows, they're not used in the most recent
Bowditch. I was introduced to using arrows on an Ocean Star trip. I
find arrows helpful in clarifying which LOP's are original and which
are advanced.
Rick
S/V One With The Wind, Baba 35
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