Tidal predections can be made years in advance, but have a huge impact on our sailing.  Knowing how to interpret the tides is a useful skill for any sailor.

Easy tides
Tide prediction website, get the tides for the next 7 days

The rule of Twelths
A quick and easy way to work out tidal heights on an hour by hour basis

Tidal streams
How to work out the strength and direction of tidal streams

Secondary port interpolation
Not sailing at a standard port? A worksheet to make secondary ports easier to predict.