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Nautical Publications
Portsmouth Harbour and Approaches
This atlas contains 13 charts for both Portsmouth Harbour and the Approaches to Portsmouth showing tidal streams at hourly intervals from 6 hours before to 6 hours after HW Portsmouth. In addition a diagram is included showing tidal streams for 3½hours after HW for Portsouth Approaches due to the extra strong streams at that particular time.
The times for HW Portsmouth and other details of the prediction for this port are given in NP201, Admiralty Tide Tables Vol.1, which is published annually.
On the tidal stream charts the directions are shown by arrows which are graded in line 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: 03,06 indicates a mean neap rate of 0.3 knots and a mean spring rate of 0.6 knots. The comma indicates the approximate position at which the observations were obtained.
