Essential Chart Work - Tidal Stream Using Tidal Diamonds - RYA Yachtmaster Theory Training
23 February 2024 · 4 min · 2K views
What this video covers
Tidal diamonds provide a method for determining tidal stream direction and speed directly from a nautical chart.Watch These symbols, marked with letters like A, C, or D, correspond to specific reference points where tidal data has been recorded.0:42 To use them, locate the tidal diamond table printed on the chart, which references high water times at a specific standard port, such as Victoria.1:29 The table lists time offsets ranging from six hours before to six hours after high water.1:56 For any given hour, the table provides the direction in degrees and two speed values: the spring rate and the neap rate in knots.3:01 While the Tidal Atlas offers a pictorial view of currents across a passage, tidal diamonds allow navigators to extract precise stream data using only the chart itself.3:38 Both methods yield the same essential information regarding current speed and direction for passage planning.3:24
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