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There were improvements in sails, masts and rigging; improvements in marine navigation including the cross tree and charts, of both the sea and constellations, allowed more certainty in sea travel.

Sailing employs the wind—acting on sails, wingsails or kites—to propel a craft on the surface of the water (sailing ship, sailboat, windsurfer, or kitesurfer), on ice (iceboat) or on land (land yacht) over a chosen course, which is often part of a larger plan of navigation.

A course defined with respect to the true wind direction is called a point of sail.

Conventional sailing craft cannot derive power from the wind in a "no-go" zone that is approximately 40° to 50° away from the true wind, depending on the craft.

Likewise, the directly downwind speed of all conventional sailing craft is limited to the true wind speed.

Conventional sailing craft cannot derive power from sails on a point of sail that is too close into the wind.

On a given point of sail, the sailor adjusts the alignment of each sail with respect to the apparent wind direction (as perceived on the craft) to mobilize the power of the wind.Lawrence, and eventually began to explore the Pacific Northwest and the Western Arctic.Sailing has contributed to many great explorations in the world.Instructions: Click on an episode and select "open" if prompted. If it doesn't or if you receive an error message, download the free Real Player software and then come back here and try again.If that doesn't work, email us at [email protected] we can help.The earliest representation of a ship under sail appears on a painted disc found in Kuwait dating between 50 BCE.

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