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Published online by Cambridge University Press: 25 April 2022
In an effort to add context to a classroom lesson on celestial navigation, we present a numerical adaptation of Captain T.H. Sumner's 1837 journey into St. George's Channel. The adaptation is programmed into a ‘live’ web-based map. This allows for a flexible and highly visual presentation that highlights two important topics in celestial navigation: the origin of the line of position and the scale of maps. Considerations driving the numerical adaptation are discussed, as is as an overview of a classroom lesson we have been using.