|
Day Skipper - Part 6 - Tidal
diamonds
If you have ever tried entering the Needles Channel three hours after
high water you will have encountered a tremendous cross-tide that will
have made getting between the Bridge Buoy and the South West Shingles
buoy an interesting manoeuvre.
There are many ways of pre-determining tidal streams. Probably the most
economic method of working out the likely tidal stream is to use the tidal
diamonds or tidal circles printed on charts themselves.
Magenta-coloured tidal diamonds are found in strategic positions on
Admiralty charts to indicate the position of tidal information, which
is shown in a table elsewhere on the chart. Other cartographers use different
shapes to show similar information.
It is important to remember that tides go in the direction of the bearing.
(Winds come from the direction of the bearing.)
|
