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Selsey Bill to Dover with a favourable tide all the way

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Overview







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What is the route?
This is tidal efficient passage timing for an 'up channel' from the area to the east of Isle of Wight to Dover Harbour.

Why sail this route?
This route and timing optimise a channel tidal anomaly that vastly favours an eastbound passage. It utilises a sequence of three channel tidal gates that enables a moderately capable yacht to make the 90-mile journey, from the eastern side of the Isle of Wight to Dover, carrying a fair tide almost all the way.

To achieve this a vessel must depart eastward from The Looe, close south of Selsey Bill, at slack water and then maintain a tide supported mean speed over the ground of no less than 7kn. Should a vessel not be able to hold to this mean speed the tidal sequence will expedite a passage to Sovereign Harbour or at least Brighton which are quick-in-and-out tide wait locations for the next tidal window.

Tidal overview
Today's summary tidal overview for this route as of Friday, December 14th at 07:12. Tidal planning is essential to optimise this passage. It is essential to be at The Looe at slack water to avail of the best following tide.

Looe Slack Water

(HW Dover +0430 to +0515)


Starts in 00:03:44

(Fri 07:16 to 08:01)

What are the navigational notes?
Please use our integrated Navionics chart to appraise the route. Navionics charts feature in premier plotters from B&G, Raymarine, Magellan and are also available on tablets. Clicking the 'Expand to Fullscreen' icon opens a larger viewing area in a new tab.

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Please zoom out (-) if all of the waypoints are not displayed.
The above plots are not precise and are indicative only.

OVERVIEW

In the English Channel, the tide does not flood and ebb but rater streams up channel turning progressively later as the tide advances up the Strait. The progressive changes of stream cease at a certain point near the mouth of the channel. Beyond that the two streams, that of the Ocean, or outer stream, and that of the Channel, which is contained between the Oceanic stream and the Strait of Dover, are always running in contrary directions to the area between Start Point and the Gulf of St. Malo.

Above this point a massive bulge of water or tidal ‘standing wave’, like the wave you get by slopping water about in a bath until it 'see-saws' up and down either end. In the English Channel, this massive bulge of water moves backwards and forwards twice each day with a pivot point in the vicinity of Poole Harbour at about the centre of the enclosed area. Hence a mean range at Poole of 1.6 metres springs and 0.5 metres neaps, as compared with 3.9 metres and 1.9 metres respectively at Portsmouth. The further one moves east and west away from the Poole nodal point, so the size of the tidal sea-saw increases.

Approaching the straits, the limits of these two streams range to and fro as the tide rises and falls at Dover, travelling to the eastward on both tides, and at high and low water suddenly shifting sixty miles to the westward, to recommence their easterly courses with the next tide. When the water on the shore at Dover begins to fall, a separation of the streams begins off Beachy Head that then creates a favourable eastward tide. As the fall continues, this line creeps to the eastward. At two hours after high water, it has reached Hastings; at three hours, Rye close west of Dungeness, circa 30 miles. On it travels until at four hours, by the shore, it has arrived nearly at North Foreland when the tidal streams turn eastward in the Strait. This tidal anomaly provides the opportunity for the tidal efficiency.


SEQUENCING

This meeting and separation of the standing wave and reverberations oscillate between three tidal gates along this route at the (i) The Looe, (ii) Beachy Head (where they create a giant anti clockwise tidal gyre) and (iii) Dungeness creates a sequence that favours an eastbound passage while being disadvantageous for those westbound.

Boulder and Street buoys marking the western side of the Looe Channel
Image: Michael Harpur


At Dover +4 a favourable southeastern stream commences from The Solent assisting an arrival at Dover +4:45 slack water at The Looe. Arriving at the Looe at this time there is a supporting back eddy for the 40 miles to Beachy Head for 6 hours.

The Looe is 1 mile long and 1¼ miles wide channel that runs east-west through the centre of The Owers. It has a channel marked by a port buoy, Street Q.R., and starboard buoy, Boulder Fl. G 2.5s on its narrower western entrance. Tidal streams in The Looe are straight-lined with the west going stream commencing at High Water Dover -0115 and the east going stream Dover +0445.


Beachy Head
Image: Ian Stannard via CC BY-SA 2.0


Exiting The Looe sail directly to Beachy Head then to pick up the sixty miles Dover tide to the west, and ride its easterly course to extend the favourable tidal window.

Port of Dover
Image: Port of Dover


Following this back eddy and eastward tidal sequence allows a vessel to ride the standing wave to Dover Click to view haven as it progressively later and later local high waters on the way and extending out the period of favourable tides.

Offshore details are available in the southeast England’s Coastal Overview for North Foreland to the Isle of Wight Route location.

LISTED WAYPOINTS

The complete course is 88.80 miles from the waypoint 'Looe waypoint' to 'Dover' tending in a east north easterly direction (reciprocal west south westerly).

Looe waypoint, 50° 41.610' N, 000° 48.945' W
This is located between the marker buoys of Street, Q.R., and Boulder, Fl. G 2.5s.

       Next waypoint: 40.27 miles, course 88.20°T (reciprocal 268.20°T)

Beachy Head, 50° 42.589' N, 000° 14.573' E
1½ miles south of Beachy Head Lighthouse, Fl(2) 20s at an elevation 31 metres that is visible from a distance of 8 miles. Stay at least 2 miles off in bad weather but close the head for higher velocity streams.

       Next waypoint: 30.19 miles, course 67.77°T (reciprocal 247.77°T)

Dungeness, 50° 53.866' N, 000° 58.856' E
1 mile south of Dungeness Lighthouse a conspicuous slender tower, 43 metres high, standing on the point, Fl 10s and visible for 21 miles.

       Next waypoint: 18.34 miles, course 45.49°T (reciprocal 225.49°T)

Dover, 51° 6.683' N, 001° 19.674' E
This is the head of the western Admiralty Pier extension at the west entrance. It exhibits a light Fl. 7.5s21m20M. During periods of reduced visibility, a high-intensity strobe light is exhibited from the pier head.

What is the best sailing time?
May to September is the traditional UK Sailing season with June-July offering the best weather. The British Isles weather is highly variable, and the amount of bad weather varies quite widely from year to year. This is because they are islands positioned between the Atlantic Ocean and the large landmass of continental Europe. As a result, the entire area lays under an area where five main air masses meet and alternate:

  • • Tropical Maritime Air Mass - from the Atlantic

  • • Polar Maritime Air Mass - from Greenland

  • • Arctic Maritime Air Mass

  • • Polar Continental Air Mass - from central Europe

  • • Tropical Continental Air Mass - from North Africa

Depending on the movements of the jet stream, any and all of these air masses can come in over the isles, creating weather fronts where they meet and bringing with them all types of weather.

The prevailing winds for the British Isles as a whole are from the western quarter which generally blows for two-thirds of the year predominantly from the southwest. Gales from the westward are felt in all seasons, but from November to March, inclusive, they are most frequent and generally last three or four days. Of these, a southwest gale is considered to be the most powerful system. The winter period is largely characterised by wind and rain.

The fine summer weather of the sailing season is typically punctuated by the passage of Atlantic depression that bringing periods of strong wind and rain, and sometimes poor visibility. These gales rarely cause surprises as they are usually forecasted well in advance. Good weather windows of 48 hours are easy to predict but any longer than that there's an increasing chance of change.

Fogs are frequent in all parts of the Channel and are formed both on the English and French coasts. In summer they only obscure the land in the morning and are readily dispersed by heat or a light breeze. But the moist haze, driven in by westerly winds from the sea, tends to linger and is only dispersed by strong winds. In the eastern part of the Channel, it is rare for the land to be completely free from mists. The only exception is when the wind is from the northeast which makes the mist free coastline highly distinctive from a great distance.

With thanks to:
eOceanic



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