| 11. | Many commercial sextants use low-expansion brass or aluminium.
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| 12. | Aircraft sextants are now out of production, but had special features.
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| 13. | Historic conditions were faithfully observed but with the addition of a Sextant.
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| 14. | In 1730 the sextant was invented and navigators rapidly replaced their astrolabes.
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| 15. | He and Hook then go off on their quest for the sextant.
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| 16. | Kahlor wrote to Christopher Shaw, a Sextant partner.
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| 17. | You are encouraged to try taking a sun-sight using a sextant.
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| 18. | One of the primary instruments used is a sextant.
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| 19. | The invention of the magnetic compass, telescope and sextant enabled increasing accuracy.
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| 20. | The navigational aids of the sextant and compass rose complete the maritime motif.
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