tidal stream prediction
Posted 10 May 2008 - 05:44 PM
(not tide charts, but the flow of areas)
or is there a 'rule of thumb' around poole for when the tide flow changes in relation to high / low tides??
Posted 11 May 2008 - 08:20 AM
I know the sort of thing you are looking for - a tidal stream chart for hours either side of LW. Many Ports have them - I wonder if they are in an almanac?
Personally, having spent many an hour racing dinghies in the harbour, you get to know e.g the whych channel flows first before any channel, and where the back eddies are but this basic info is also on the chart of the harbour.
If no one else posts here, I'll ask a few friends at the club, as you say, someone must have this info.
Posted 11 May 2008 - 09:22 AM
Not online stuff, but I use a softeware package called "Passage Planner". It's brilliant. GIves the whole English Channel tidal flows direction, speed etc in half hour jumps.
Posted 11 May 2008 - 01:07 PM
Posted 11 May 2008 - 10:26 PM
I can bring a copy to the next meeting if anyone wants a look.
I have one for the channel islands, which I copied for the boats going on the recent trip.
Its available from the HMSO.
I had a chance to look at Toms system and it was very good, I may get a copy.
Posted 19 May 2008 - 05:47 AM
I have NP263 for Lyme Bay/Weymouth bay areas. There are smaller specific charts for Portland and Portsmouth.
Direction arrows and 2 figures (strength of tide Neaps/Springs) are shown at various locations - just don't do what I stupidly did and assume that 22 means 22 knots!! The Admiralty doesn't bother with decimal points - that's 2.2 knots