Difference between revisions of "Leeway"
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==Definitions== | ==Definitions== | ||
*1a : off-[[course]] lateral movement of a ship when under way | *1a : off-[[course]] lateral movement of a ship when under way | ||
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*2: an allowable margin of [[freedom]] or variation : [[tolerance]] | *2: an allowable margin of [[freedom]] or variation : [[tolerance]] | ||
==Description== | ==Description== | ||
| − | '''Leeway''' is the amount of drift [[motion]] to [ | + | '''Leeway''' is the amount of drift [[motion]] to [https://en.wikipedia.org/wiki/Leeward leeward] of an object floating in the water caused by the component of the [[wind]] [[vector]] that is [[perpendicular]] to the object’s forward motion. The National Search and Rescue Supplement to the International Aeronautical and Maritime Search and Rescue Manual defines leeway as "the movement of a search object through water caused by [[winds]] blowing against [[exposed]] surfaces". However, the resultant total motion of an object is made up of the leeway drift and the movement of the upper layer of the [[ocean]] caused by the surface currents, [https://en.wikipedia.org/wiki/Tidal_currents tidal currents] and [https://en.wikipedia.org/wiki/Ocean_currents ocean currents]. Objects with a greater [[exposure]] to each element will experience more leeway drift and overall movement through the water than ones with less exposure. |
| − | A [[navigator]] or pilot on a vessel must [[adjust]] the ordered [[course]] to compensate for the leeway drift and more important [ | + | A [[navigator]] or pilot on a vessel must [[adjust]] the ordered [[course]] to compensate for the leeway drift and more important [https://en.wikipedia.org/wiki/Set_and_drift set and drift], an all [[encompassing]] term for drift that includes the steering error of the vessel. Failure to make these adjustments during a [[voyage]] will yield poor navigational results. [https://en.wikipedia.org/wiki/Bowditch%27s_American_Practical_Navigator Bowditch's American Practical Navigator] (1995) offers a comprehensive free [[guide]] to [[navigation]] principles. |
An object can be [[classified]] as either an active object like a ship navigating through a waterway or a passive object like a liferaft, drifting debris, or a [[person]] in the water (PIW). A passive object will [[experience]] the greatest leeway drift and it is this drift that is of utmost importance to those involved in search and rescue (SAR) upon inland waterways and open [[oceans]]. | An object can be [[classified]] as either an active object like a ship navigating through a waterway or a passive object like a liferaft, drifting debris, or a [[person]] in the water (PIW). A passive object will [[experience]] the greatest leeway drift and it is this drift that is of utmost importance to those involved in search and rescue (SAR) upon inland waterways and open [[oceans]]. | ||
| − | Leeway is used as a synonym for the [[ability]] to [[exercise]] [[freedom]], [[flexibility]] or latitude in [decision]-making [[processes]].[ | + | Leeway is used as a synonym for the [[ability]] to [[exercise]] [[freedom]], [[flexibility]] or latitude in [decision]-making [[processes]].[https://en.wikipedia.org/wiki/Leeway] |
[[Category: General Reference]] | [[Category: General Reference]] | ||
Latest revision as of 01:27, 13 December 2020
Definitions
- 1a : off-course lateral movement of a ship when under way
- b : the angle between the heading and the track of an airplane
Description
Leeway is the amount of drift motion to leeward of an object floating in the water caused by the component of the wind vector that is perpendicular to the object’s forward motion. The National Search and Rescue Supplement to the International Aeronautical and Maritime Search and Rescue Manual defines leeway as "the movement of a search object through water caused by winds blowing against exposed surfaces". However, the resultant total motion of an object is made up of the leeway drift and the movement of the upper layer of the ocean caused by the surface currents, tidal currents and ocean currents. Objects with a greater exposure to each element will experience more leeway drift and overall movement through the water than ones with less exposure.
A navigator or pilot on a vessel must adjust the ordered course to compensate for the leeway drift and more important set and drift, an all encompassing term for drift that includes the steering error of the vessel. Failure to make these adjustments during a voyage will yield poor navigational results. Bowditch's American Practical Navigator (1995) offers a comprehensive free guide to navigation principles.
An object can be classified as either an active object like a ship navigating through a waterway or a passive object like a liferaft, drifting debris, or a person in the water (PIW). A passive object will experience the greatest leeway drift and it is this drift that is of utmost importance to those involved in search and rescue (SAR) upon inland waterways and open oceans.
Leeway is used as a synonym for the ability to exercise freedom, flexibility or latitude in [decision]-making processes.[1]
