Leeway: Difference between revisions
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'''Leeway''' is the motion of an object to [[leeward]] due to the component of the wind vector perpendicular to the object's track. <ref name="BOWDITCH">[Bowditch. (1995). The American Practical Navigator. Pub. No. 9. 1995 Edition. Defense Mapping Agency Hydrographic/Topographic Center. Bethesda, MD. p.116.</ref> 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." <ref name="IAMSAR">[National Search and Rescue Committee, (2000). "U.S. National Search and Rescue Supplement to the International Aeronautical and Maritime Search and Rescue Manual," Washington D.C.</ref> The resultant total motion taking into account the wind and current is the leeway drift of an object. Leeway drift is the combined motion of a passive object's motion due to the wind and the current. Objects with greater exposure to each element will experience more leeway drift than ones with less exposure. |
'''Leeway''' is the motion of an object to [[leeward]] due to the component of the wind vector perpendicular to the object's track. <ref name="BOWDITCH">[Bowditch. (1995). The American Practical Navigator. Pub. No. 9. 1995 Edition. Defense Mapping Agency Hydrographic/Topographic Center. Bethesda, MD. p.116.</ref> 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." <ref name="IAMSAR">[National Search and Rescue Committee, (2000). "U.S. National Search and Rescue Supplement to the International Aeronautical and Maritime Search and Rescue Manual," Washington D.C.</ref> The resultant total motion taking into account the wind and current is the leeway drift of an object. Leeway drift is the combined motion of a passive object's motion due to the wind and the current. Objects with greater exposure to each element will experience more leeway drift than ones with less exposure. |
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Revision as of 19:01, 4 November 2008
Leeway is the motion of an object to leeward due to the component of the wind vector perpendicular to the object's track. [1] 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." [2] The resultant total motion taking into account the wind and current is the leeway drift of an object. Leeway drift is the combined motion of a passive object's motion due to the wind and the current. Objects with greater exposure to each element will experience more leeway drift than ones with less exposure.
A navigator on a vessel must adjust the ordered course to compensate for the leeway drift. Failure to make these adjustments during a voyage will yield poor navigational results. An object can either be active like a ship navigating through a waterway or a passive object like a liferaft. A passive object will also experience leeway drift. It is this drift that is of utmost importance to those involved in search and rescue upon the inland waterways and oceans.[3]
References
- ^ [Bowditch. (1995). The American Practical Navigator. Pub. No. 9. 1995 Edition. Defense Mapping Agency Hydrographic/Topographic Center. Bethesda, MD. p.116.
- ^ [National Search and Rescue Committee, (2000). "U.S. National Search and Rescue Supplement to the International Aeronautical and Maritime Search and Rescue Manual," Washington D.C.
- ^ [Allen. (2005). Leeway Divergence. Government Report prepared for the U.S. Department of Homeland Security. January 2005. CG-D-05-05. Retrieved. from http://oai.dtic.mil/oai/oai?verb=getRecord&metadataPrefix=html&identifier=ADA435435.