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Nautical Publications
Plymouth Harbour and Approaches
This atlas contains 13 charts for each of the Approaches to Plymouth, Devonport Dockyard and the River Tamar showing tidal streams at hourly intervals from 6 hours before to 6 hours after HW Devonport.
The times for HW Devonport 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 --> 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.
