What instrument do the inhabitants of Laputa primarily use for navigation?

The inhabitants of Laputa primarily use a telescope for navigation, as depicted in "Gulliver's Travels." This aligns with the satirical portrayal of these characters, who are obsessed with mathematics and astrology, often to the point of absurdity. The use of a telescope highlights their preference for lofty, theoretical perspectives over practical, grounded experiences. This focus on observation rather than straightforward navigation methods like a compass or a map serves to critique the disconnect between intellectual pursuits and real-world applicability in Swift's narrative. The other choices, while relevant in the context of navigation, do not capture the unique and exaggerated nature of Laputan society as effectively as the telescope does.