Tides Basics

• Explain high water, low water, tidal height, tidal streams, and why tide matters before leaving.
• Apply high water to a realistic onboard situation.
• Recall the core check: high water is the local peak of the tide.

A self-guided revision companion that explains essential concepts, then helps you practise and test them. It supports—but does not replace—recognised instruction, practical training, assessment or certification. Access is a one-time payment, not a subscription.