| 11. | They dealt with the accuracy of chronometers and the magnetic compass.
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| 12. | The crew had a single sextant and a chronometer of unknown reliability.
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| 13. | Kirium comes in automatic Swiss Official Chronometer Control certified and quartz versions.
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| 14. | The book remains the authoritative work on the marine chronometer.
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| 15. | Winding and comparing the chronometers was a crucial duty of the navigator.
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| 16. | The rate of a mechanical marine chronometer is sensitive to its orientation.
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| 17. | The term chronograph is often confused with the term chronometer.
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| 18. | Surviving chronometers from this series include Numbers 3, 29 and 28.
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| 19. | In fact, several of these chronometers were by Arnold and Dent.
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| 20. | The six-digit Daytonas are chronometers with chronograph functions.
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