👉 In navigation, an undersweep is a maneuver where a vessel turns to avoid taking on course in front of it. This maneuver is often used by vessels that are trying to maintain their position or navigate around obstacles, such as islands or rocks. Underneath, "undersweep" typically refers to the action of turning sharply and suddenly to avoid taking on course in front of another vessel. It's a common maneuver when navigating through choppy water or in conditions where visibility is limited.