A vessel at LAT 20°10'N, LONG 122°00'E is to proceed to LAT 26°18'N, LONG 128°20'E. What are the course and distance by mid-latitude sailing?

Correct Answer: Option C — 043.5°T, 507.3 miles

Mid-latitude sailing utilizes the mean latitude to convert departure into difference of longitude. Using the formulas DLo = Dep / cos(Lm) and tan(Course) = Dep / DLat, the calculated values yield a course of 043.5°T and a distance of 507.3 miles, consistent with Bowditch’s standard navigation procedures for rhumb line calculations.