Rule of Twelfths

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

Sailing across the Atlantic ocean

The safest way to sail westbound across the Atlantic is to get your timing right and follow the trade winds.

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.

Marine navigation buoys

Mariners can be confused by differences in navigation buoys worldwide.

Automatic Identification System

AIS gives useful warning of the approach of other vessels

Rules when in narrow channels

The Collision Regulations apply to all mariners. But some believe they can be abused.