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| CATEGORIES ABOUT TIDAL DIAMOND | |
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Tidal diamonds are symbols on British Admiralty Chart s that indicate the direction and speed of Tidal Streams . The symbols consist of a letter of the Roman Alphabet in a Rhombus , printed in purple ink. On any particular chart each tidal diamond will have a unique letter starting from "A" and continuing alphabetically. Somewhere on the chart, generally on land, will be a ''Tidal Diamond table''. This contains a grid of thirteen rows and three columns for each Diamond. The rows are the hours of the tidal cycle showing the 6 hours from Low Water to High Water , high water itself and the 6 hours from high water to low water. The columns show the Bearing of the tidal stream and its speed, in Knot s, at both Spring Tide and Neap Tide . The times on the table are related to the high water of the Standard Port displayed on the table. An alternative to a tidal diamond is a Tidal Atlas which are often more accurate and easier to use (if available). CAUTION: It is dangerous to attempt maritime navigation without proper training. |
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