What is one tool explorers used to keep track of where they were going

One of the first ways explorers located north was to use a lodestone, a magnetic rock suspended on a string or poised on a piece of wood. Sometimes needles were magnetized by a lodestone and hung on a string to indicate true north. Eventually, the Venetians devised a compass that indicated the four directional points and used a magnetized needle.

Explanation:

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most people were factory or company owners.