Question 1

The multi-hour course-to-steer method handles six hours of changing stream by…

Accepted Answer

Summing the hourly stream vectors and closing ONE triangle with six hours of boat speed — All the displacement is added head-to-tail, one closing course is computed, and the boat swings off and back across the rhumb line — arriving on target with one steered number.

Question 2

Two stream hours of +2.5 kn and −2.2 kn “nearly cancel”. What does the average hide?

Accepted Answer

The hour of strong wind-over-tide sea you will sail through — Net 0.3 kn describes the arithmetic, not the passage: somewhere in the middle you spend an hour in a strong stream, with the sea state to match. The hourly table shows it; the average buries it.

Chaining the hours

This lesson is part of a paid course