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In addition, meteorological conditions will change the time and depth of high water, which makes our starting point variable. Even for Portsmouth (the main reference port for the Solent) there can be over half an hour difference on high water depending on the source. Tidal atlases work from a reference port for tide times, and these differ depending on the source of the data. There is a mass of information at our fingertips but we still have to be able use it.
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However, we’re now in a more electronic era and can download electronic forms of tidal atlas and animate them. This is great for planning passages in a traditional way with paper charts to determine courses and tidal gates, and I for one would not want to sail distances without them. Admiralty charts have tide diamonds on them giving speed and direction. Knowing the time of high water at Dover we can work out tidal flow direction around the country and, with a little extra work, we’ll also get the rates depending on whether it is neaps or springs.
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We have been helped for many years by the Admiralty Tidal Stream Atlases – the NP series covers all of UK waters. This does vary as a high swell adds water to the lagoon increasing the length and speed of the ebb. We made up our own tables from observations to estimate slack water and tide times. Information is not very reliable but trying to enter a lagoon against the tide is tricky, if not impossible, as the ebb will often run at six-plus knots. Most sailing areas around the world are tidal on our recent passage to Australia the tides and currents could be quite vicious around the islands and atolls of the South Pacific. Not only does tidal flow make a significant difference to our speed over the ground, it also affects comfort it might be quick with 3 knots of tide under us, but if that’s against 20 knots of wind it’ll be uncomfortable verging on damaging or dangerous. Whether racing or cruising, our first thoughts are always: ‘What is the tide doing?’ When I grew up sailing in Scotland, leaving anchorages before dawn to catch a tide was the norm.