- 155 -

9. If entering between Cape Lorn and White Shoal give the
Cape a berth of about 2 miles, then steer for the extreme
of Swan Point, bearing 074°, until Lorn Island bears 272°,
which bearing, kept on ahead, leads in mid-channel between
Black Rock and White Shoal, or bring South-East Barr Island
to bear 040°. When Sun Islet bears 142°, proceed as directed
according to channel chosen.
10. Times and heights of high water and low water in the
North Sea S of latitude 56°N may be predicted from chart
5059 - Southern North Sea.
When using tidal data so obtained, and particularly
when calculating depths along the deep water routes in the
E North Sea, due consideration must be given to the
meteorological effect on tides. See the cautions printed
on the charts.
11. Data for predicting tidal streams in that part of the
area covered by this Volume which lies S of latitude
54°15'N and W of longitude 8°10'E are given in the Tidal
Stream Atlas of the North Sea, Southern Position. In general
terms, the stream midway between England and the Netherlands
is nearly rectilinear, and begins to run from the North Sea
towards Dover Strait at about - 0515 Dover, and in the
opposite direction about +0100 Dover, the spring rate in
each directions is 1 1/2 to 2 knots.
12. Tides in the E part of the North Sea are semidiurnal.
The following table of spring ranges indicates the greater
ranges experienced in the inner part of Deutsche Bucht,
and the diminution of range towards the N point of Denmark
where the tides are scarcely perceptible.

See also chart 5O59 - Co - tidal chart for the S part
of the North Sea.