quarta-feira, 6 de abril de 2016

The SEA’s surface - My favorites quotes from the famous Bowditch


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"Tidal current is the periodic horizontal movement of the water’s surface caused by the tide-affecting gravitational forces of the Moon and Sun. Current is the horizontal movement of the SEA's surface caused by
meteorologicaloceanographic, or topographical effects. 

From whatever its source, the horizontal motion of the SEA’s surface is an important dynamic force acting on a vessel. Set refers to the current’s direction, and drift refers to the current’s speed. Leeway is the leeward motion of a vessel due to that component of the wind vector perpendicular to the vessel’s track. 

Leeway and current combine to produce the most pronounced natural dynamic effects on a transiting vessel. Leeway especially affects sailing vessels and high-sided vessels."

CHAPTER 7. DEAD RECKONING

BOWDITCH

THE AMERICAN PRACTICAL NAVIGATOR



Leia uma explicação para esta série de 30 posts clicando aqui


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