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Nautical Publications
Firth of Clyde and Approaches
This atlas contains 13 charts showing tidal streams at hourly intervals commencing 6 hours before HW Dover and ending 6 hours after HW Dover. It also includes 8 plans of Rathlin lsland and Sound, showing tidal streams at varying intervals from 5 hours before to 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 tidal streams charts the directions are shown by arrows which are graded in line weight and, where possible, in length to indicate the approximate strength 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: 13,27 indicates a mean neap rate of 1.3 knots and a mean spring rate of 2.7 knots. The comma indicates the approximate position at which the observations were obtained.
