Navigating using tidal diamonds involves locating the diamond symbol on your chart and then finding the corresponding tidal data table.
Using a tidal diamond on a nautical chart is essential for understanding tidal streams in a specific area. It allows boaters to find detailed information about the direction and speed of tidal currents, which is crucial for safe and efficient navigation. The process primarily involves identifying the symbol on the chart and cross-referencing it with its associated data.
Here are the steps to use a tidal diamond effectively:
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Find a Tidal Diamond Near Your Location: Look for the distinct diamond shape printed on your nautical chart. These diamonds are typically marked with a letter inside (e.g., A, B, C). Choose a tidal diamond that is closest to the area where you will be boating or navigating. These symbols indicate a specific location for which detailed tidal stream data is provided elsewhere on the chart.
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Locate the Tidal Diamond Data Table: Once you have identified the relevant tidal diamond and its letter identifier, you need to find the corresponding data table on the chart. This table is usually located in a margin or a dedicated section away from the main charted area. It lists the tidal stream information for each marked diamond location.
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Interpret the Data Table: In the tidal data table, find the section or row that matches the letter identifier of the diamond you selected. The table contains columns of data showing the tidal stream's direction and rate at various times relative to high water or low water at a standard port. According to the reference, you will find directions on what each column means within the table's description. Crucially, the information at the top of the column typically provides the geographical location of that specific tidal diamond point in Latitude and Longitude, confirming you are looking at the data for the correct location.
By following these steps, you can access the specific tidal stream information associated with a tidal diamond marker on your chart, allowing you to account for currents when planning your route.
