Underway

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Underway, or Under Way is a nautical term describing the state of a vessel. "Way" arises when there is sufficient water flow past the rudder of a vessel that it can be steered. A vessel is said to be underway if it meets the following criteria:

If a vessel is adrift and not being propelled by any instrument or device, it is said to be underway, not making way. The concept of whether a vessel is or is not underway has important legal ramifications. For example, in many jurisdictions a child must be wearing a personal flotation device at the time the vessel is underway.

"Under weigh" is a variation, coming from folk etymology, first used in 1749. "Under way" is likely from the Dutch onderweg or Middle Dutch onderwegen (lit. "under" or "among the ways").[1]

References

  1. Merriam-Webster Mobile Dictionary, 2015, entries for "under weigh" and "under way".
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