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“The sundial was designed to tell the time by the sun at any latitude, being set by a compass and radial bar calibrated in degrees. This sundial has the initials J.C. incorporated into the design within the brass circle and was supposedly designed by Cook himself. However, this is unlikely as Cook was only twenty years old and learning the business on a North Sea collier when Thomas Wright (instrument maker) retired in 1748.” you can read more here
You can see more navigational instruments on in Discover Collections