Plan position indicator

The Plan Position Indicator (PPI) is a navigational tool commonly used in radar systems, particularly in air traffic control and aviation. It visually represents the position of aircraft on a two-dimensional display, showing their location in relation to pre-defined flight paths, airspace, and other navigational aids. The PPI operates on the principle of radar technology, where it emits radio waves that bounce off objects (like aircraft) and return to the radar system.