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Yankee sails on

The Johnsons — Irving and Exy — weren’t your average American married couple. The Johnsons completed seven circumnavigations beginning in the 1930s, all aboard boats named Yankee, with…

A digital sextant

Sextants are wonderfully analog optical devices. A sextant user from the 1850s would have little problem using a modern sextant. Now a company in South Korea has begun offering something it calls the Korea Digital Sextant (KDS) that digitalizes…