A course, in the context of marine navigation, is the intended path or direction in which a boat, ship, or any other waterborne vehicle is steered or navigated. This strategic route, expressed in degrees from 0° to 360°, is typically determined based on various factors such as current, tide, wind, and obstacles to secure a safe and efficient journey. Changes in this planned course are often necessary based on navigational updates and external marine conditions.

1. The captain set a northbound course to reach Alaska from Seattle. 2. The course had to be quickly adjusted to avoid the incoming storm. 3. The navigator plotted a course to guide the ship through the dangerous reefs. 4. After seeing whales ahead, they altered the boat's course to get a closer look. 5. The sailing team maintained a south-east course to catch the maximum wind.

Fun Fact: The term "course" is not just about the direction a boat is steered in nautical terminology. It's much more complex and fascinating! In marine navigation, "course" is typically referred to as the path that a vessel plans to follow, which is also known as the "course made good" or CMG. This planned course takes into account the Earth's curvature, tide, wind, and other sea conditions. The planned route or "course" is often charted on a nautical map using various tools and compass readings. Moreover, although modern GPS systems now automate extended course plotting on ships, the basic understanding of setting a course is still a crucial part of maritime tradition and education. Navigating a course tests one's knowledge of the sea, meteorology, and maths - making it an intriguing aspect of sea voyages.