How to read a 500mb chart

Article Abstract:

A 500-millibar (mb) upper-air chart is useful when sailing since it shows the speed and direction of lower-level jet-stream winds. The factors considered important when reading a 500 mb chart are troughs and ridges, contour lines, and high-pressure analysis.

Forecasts and trends, Weather, Speed, Winds, Wind velocity

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A gift in time

Article Abstract:

A sailor describes the satisfying experience of using an old compass last used in World War II for navigation, rather than his global positioning system, while sailing his yacht to Amityville, NY, for a winter refit.

Methods, Compasses (Navigation), Compass

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Taming the chart collection

Article Abstract:

Electronic and graphical methods of organizing charts used for cruise sailing are described.

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