When completing an online Hold Mail request, a confirmation page will be displayed with a confirmation number to verify your request has been accepted. Make sure you print out this page or copy down your confirmation number for future reference.
The tidal range is the vertical difference between the high tide and the succeeding low tide. Tides are the rise and fall of sea levels caused by the combined effects of the gravitational forces exerted by the Moon and the Sun and the rotation of the Earth.
Tidal Ranges increase and decrease twice every 28 days, as the moon waxes and wanes. The following tidal curves have been produced using tidal data for Cardiff, but 2016 & 2017 Spring and Neap tide dates will be consistent throughout the UK. These graphs are provided as an aid to dive planning.