Your radar displays your ship off center. What is this display called when your ship's marker moves on the PPI scope while echoes from land masses remain stationary?

The situation described is known as true motion. In this mode, the radar display presents a real-time representation of the navigational environment, where stationary echoes from land masses remain fixed on the screen while the ship’s marker moves. This means that as the vessel sails, the position of the ship is shown as it traverses the radar display, clearly indicating the ship's movement relative to the land.

True motion is particularly useful for understanding the vessel's position in relation to fixed objects and helps in making navigational decisions as it depicts the actual movement over the earth's surface. It enables the navigator to analyze how to approach different geographical features while maintaining awareness of the vessel's trajectory. Understanding this concept is crucial for effective navigation, especially in congested or unfamiliar waters.