A practical, do-it-yourself guide to adjusting compasses without bearings at sea.
This book offers clear, step-by-step instructions for compensating ship compasses using magnets, magnets and spheres, and practical tests at sea. It emphasizes usable, non‑theoretical methods that navigators can apply in real conditions.
This edition presents hands-on guidance on arranging the deflector, measuring forces, and verifying compensation both on shore and during voyages. It blends practical rules with cautionary notes to help avoid disturbances from iron in a ship and to maintain accuracy as conditions change.
- How to place magnets and spheres to correct compass deviations in different ship situations
- Techniques for ensuring the deflector and the compass work together reliably
- Procedures for verifying compensation at sea and after long voyages
Ideal for ship officers, navigators, and crews responsible for compass accuracy in iron ships.