Question 1

You double the angle on the bow from 30° to 60°, having run 2.4 nm between readings. Your distance from the object is now…

Accepted Answer

2.4 nm — The track and the two bearings form an isosceles triangle: distance off at the second moment equals the distance run. No plotting required.

Question 2

The “four points doubled” special case (45° → 90°) is prized because…

Accepted Answer

It gives distance-off exactly when the object is abeam — your closest point on a straight track — Abeam is the natural checkpoint of a coastal leg, and the run between 45° and 90° IS the abeam distance. A ten-second sanity check on the plotter.

Doubling the angle on the bow

This lesson is part of a paid course