What is the quest in the story
The sword Excalibur

There was a famous sword in Irish legend called Caladbolg, from which Excalibur is evidently derived by way of Geoffrey of Monmouth, whose Historia regum Britanniae refers to Arthur's sword as Caliburn. Malory says that Excalibur means “cut-steel.”

Explanation:

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a. the astrolabe could determine the correct latitudinal location of the ship

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