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They would use it to know when the tides are in and out, which could be important for them when they are planning a journey. If they are going into a port with a large boat and the tide was too low, they could run aground. If they are trying to launch a boat from land, they would want a high tide to make it easier. There are lots of other reasons why they would want to know what the tides are at, so the tidal tables would be important for them.

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8y ago

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