What to know for Compass Checks by Celestial Body
Explain how a celestial bearing can be used to check compass error during an ocean passage.
Using sun, moon, star, or planet bearings to check compass error. This module is mapped to the published course boundary for Yachtmaster Ocean and Astro Navigation Revision and written as an independent revision aid, not official training material.
Key Points
- Compare observed compass bearing with calculated true bearing
- Allow for variation to isolate deviation
- Record conditions and heading
- Compass checks support safe ocean navigation
Last reviewed: 6 July 2026 by Compass Revision curriculum review
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