The Sumner Line (Classic Reprint): Or Line of Position as an Aid to Navigation: Or Line of Position as an Aid to Navigation (Classic Reprint) - Softcover

Inhaltsangabe

Master the Sumner line method to fix a ship’s position at sea with confidence. This practical guide shows how to reduce observations of the sun, moon, and stars into reliable lines of position, using standard forms, tables, and example problems.

This edition explains the core ideas behind the Sumner line, discusses how to use spherical traverse tables, and compares different reduction methods. It emphasizes practical steps, clear notation, and hands-on exercises that help navigators apply the method at sea or in training.

• How to convert celestial observations into a line of position with step-by-step reductions


• How to use form templates and computing aids to organize data quickly


• How to interpret tables and interpolate accurately for common navigational scenarios


• How to check results and reconcile with dead reckoning for improved accuracy

Ideal for readers with some navigation knowledge who want to expand their tools for fixing a ship’s position at sea, including those studying traditional methods and modern sailors seeking historical perspective.

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