What does it mean when a vessel is said to 'plot'?

When a vessel is said to "plot," it refers to the process of determining a course. This involves marking a course on a nautical chart, which is essential for navigation. By plotting a course, mariners can identify the intended route a vessel should take from one point to another, taking into consideration various factors such as waypoints, obstacles, and navigational aids.

Plotting is a critical navigational skill, as it allows the captain to visualise the journey ahead and plan accordingly. This process enhances safety on the water by ensuring that the vessel adheres to a well-defined route, which is particularly important in busy or hazardous waters. Proper plotting also aids in monitoring progress and making necessary adjustments during the voyage.