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Nautical Publications
THE ENGLISH CHANNEL
This new edition of NP250 has been reschemed to a larger scale and now includes Tidal Stream information for the English Channel only. Tidal Streams for the Bristol Channel which hitherto were included in both NP250 and NP256 are now inly shown in the latter.
This atlas contains 13 pairs of charts showing tidal streams at hourly intervals commencing 6 hours before HW Dover and ending 6 hours after HW Dover. The times of HW Dover and other details of the prediction for this port are given in NP201, Admiralty Tide Tables Vol.1, which is published annually. NP201 also gives tidal predictions for a number of ports and tidal stations in the area covered by this atlas.
On the charts the directions of the tidal streams are shown by arrows which are graded in weight and, where possible, in length to indicate the approximate rate of the tidal stream. thus -> indicates a weak stream and --> indicates a strong stream.
The figures against the arrows give the mean neap and spring rates in tenths of a knot, thus: 19,34 indicates a mean neap rate of 1.9 knots and a mean spring rate of 3.4 knots. The comma indicates the approximate position at which the observations were obtained.
