A graphic representation of the
official South African Tidal Data.
The images present - at a glance -
specific and relative information about the
predicted tidal, solar and lunar variation at a
given location for a 24 hour day.
"wavelike" white line shows the tidal
variation for the given day. A white dot on the
white line indicates the high or low tide
respectively for the day in question.
two bands of orange and blue coloured square
marks indicate all the predicted high and low
tides for the specific year at that location. The upper band of
coloured marks are all the predicted high tides,
whilst the predicted low tides are presented by
the lower band of coloured square marks. When the
tide marker is orange, then that specific tide is
still to come later in the year. When the marker
is blue, then that tide has already passed. It
follows that towards the end of the year there
will be many blue marks, whilst at the beginning
of the year the marks will be predominantly
two bands of predicted high and low values
establish a footprint or tidal range for a given
year. Predicted tides will always lie within this
range. Note that such a footprint shows during
which times of the day predominantly high-water
or low-water will occur. For instance, "high
water" is oriented around the 1st and 3rd
quarter of the day, whilst low water is oriented
around the 2nd and 4th quarter of the day.