Uttmark's guide to the United States local inspectors examination for masters and mates of ocean going steam and sailing ships (1919)
Uttmark, Fritz E · [New York] The Author · leaf 103
lest form ofsuch spherical sailings. It is the method of convert-ing the departure into difference of longitude or thereverse. It is used when the ship sails on a true eastor west course or when the direction between two 67 UTTMARKS GUIDE places is direct east or west. In fig. D let A and… … and P E. R the equatorial radius of the earth F £or F D. r the radius C B of the parallel A B and Lthe latitude of that parallel. Then since A B andD E are small arcs of two circles and are thereforeproportional to the radius of the circles. We havethe equations: A B C B Departure r .=x= or «= — D…
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