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

George C. Comstock

9780331365160: The Sumner Line: Or Line of Position as an Aid to Navigation (Classic Reprint)

Hardcover

ISBN 10: 0331365162 ISBN 13: 9780331365160

Publisher: Forgotten Books, 2017

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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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