Navigation - how to find your way by sea

Rule of Twelfths

The Rule of Twelfths provides navigators with a method of estimating the rate of regular tidal flows

Traffic Separation Schemes

Where ships and other vessels converge the risk of collision becomes high. To minimise this risk larger vessels are obliged to stay within defined channels. Smaller craft also have their obligations.

Rules when in narrow channels

The Collision Regulations apply to all mariners at all times. But some wrongly believe they can sometimes be ignored.

Sea Books