October 22, 2020

Use of the tide tables

The tide tables are used to determine the heights and times of high and low water at all the major ports in Namibia and South Africa. They are also used to determine the height of tide at anytime during the year at these ports. When using the tables certain parameters […]
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October 22, 2020

Currents and tidal streams

Nature of currents. Currents are permanent or seasonal horizontal movement of water flowing in a certain direction and in the oceans caused by differences in temperature, salinity, density and wind.  Information concerning their direction and strength is given on charts, in Sailing Directions and various current atlases.  The net result […]
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October 22, 2020

Definitions

The following terminology is used with currents and tidal streams: Set – we speak about the set of the current/tidal stream when referring to its direction of flow. It is expressed in degrees (°). Rate – this is the speed of the current/tidal stream expressed in knots. Drift – this […]
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October 22, 2020

Plotting symbols

When plotting courses of vessels and the set of a current/tidal stream, the direction of travel is indicated by arrow heads pointing in the direction of travel. The number of arrow heads differentiate between courses steered, courses made good and the set of a current/tidal stream: One arrow head = […]
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