Using data from the UK Hydrographic Office, this plugin provides times of High and Low Water for over 600 locations around the UK. Predictions up to seven days in the future are available.
An Internet connection is needed to provide access to the data.
Download the locations and right-click close to a tidal station to show the predictions.
At present you need to re-start OpenCPN to remove the tidal station locations.

Plugin by Mike Rossiter