The Thames Estuary is amongst the more complex waters for yachtsmen and women to navigate in the UK. Despite the sandbanks, narrow channels, swatchways, tides and shipping, it can and is crossed easily, in comfort and with interest. None of your featureless channel waters here! The book contains 32 suggested routes between landfall waypoints off Ramsgate and the major rivers of Kent, Essex and Suffolk. These routes are linked to passage planning tables that enable you to quickly plan your passage in a fraction of the time you will take using tidal diagrams, charts and drawing vectors.
Amazon £17.95 ISBN 978184623040 Publisher: Imray
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Determining the height of water in the Spitway. “Every 30 minutes the Port of London Authority broadcasts the height of tide at several points in the estuary on Channel 69. These broadcasts are at 15 minutes to and 15 minutes past the hour.
Channel 69 is relatively busy so it may be delayed a few minutes. The tide data is always preceded by 3 pips (broadcast by the PLA; not a DSC warning). They then give 4 tidal heights, starting with Walton.
Record the tidal height at Walton and add to the charted depth. This will provide a reasonable approximation of the water available in the Spitway. Note that the tide is earlier at Walton by about 28 minutes but the height is offset by a slightly larger range of tide at the Spitway.
On the chartlet the depths are in metres reduced to Chart datum. Positions refer to WGS 84 datum. These soundings were taken in July 2010 and of course may change.”
THE CHARTLETS CAN BE SEEN ON THE WEBSITE ON THE DOWNLOADS SECTION