New and Accurate Method of Finding a Ship's Position at Sea (Classic Reprint) - Hardcover

Thomas H. Sumner

9780331896626: New and Accurate Method of Finding a Ship's Position at Sea (Classic Reprint)

Hardcover

ISBN 10: 0331896621 ISBN 13: 9780331896626

Publisher: Forgotten Books, 2017

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Master a practical way to fix a ship’s position at sea, even when shadows and weather limit observations.

This edition presents a hands‑on method for finding latitude and longitude by projecting circles of position from limited sun observations. It shows how to use a single altitude, two altitudes, and chronometer times to determine where a vessel lies, and how to apply these rules when conditions are difficult or one observation is all that’s possible.

Designed for active navigation, the approach blends simple geometry with real‑world sailing needs. It explains the logic behind projecting parallels and how to read land bearings on the chart to improve safety near coastlines.

How to determine bearing of land from a single sun observation at any hour.
How two altitudes, with elapsed time, reveal latitude and, with a chronometer, longitude.
How to use a single altitude when a second is not available, including near troubled weather or when visibility is limited.
Practical examples and explanations that connect theory to everyday navigation.

Ideal for mariners seeking a dependable, clock‑and‑sun based method to fix position, especially when visibility is poor or coastlines loom on the horizon.

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