PREVIEW

... the watch.

These are items for navigation.

Vitamin supplements are essential. Sailors of this era died en masse from mysterious ailments, and the fact that it was scurvy caused by vitamin C deficiency was only discovered centuries later.

The watch and nautical chart are likewise crucial.

It would take until the 18th century for John Harrison to develop a clock that works accurately at sea. And until then, there were no clocks that worked reliably without error at ...

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