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Backstaff vs Jackstaff - What's the difference?

backstaff | jackstaff |

In nautical terms the difference between backstaff and jackstaff

is that backstaff is an early navigational instrument for measuring the altitude of the sun and hence calculating latitude while jackstaff is a short spar, at the bows of a ship, that serves as a flagpole to fly a flag (a jack.

backstaff

English

Noun

(wikipedia backstaff) (en noun)
  • (nautical) An early navigational instrument for measuring the altitude of the sun and hence calculating latitude

    • jackstaff

    English

    Noun

    (wikipedia jackstaff) (en noun)
  • (nautical) A short spar, at the bows of a ship, that serves as a flagpole to fly a flag (a jack )