What display type shows the surrounding area with the radar origin normally at the center of the screen?

The Planned Position Indicator (PPI) is a type of radar display that presents a two-dimensional view of the surrounding area, with the radar origin typically positioned at the center of the screen. This format is particularly effective for situational awareness, allowing operators to see target positions and movements relative to their own location in real time. The PPI display enables easy interpretation of the radar data, highlighting distances and bearings from the radar source, which is essential for trajectory plotting and navigation.

Other display types, such as the AN/SPA-25G, are specific radar systems that may not use the PPI format; rather, they often employ various additional functionalities tailored to specific operational needs. Dead reckoning displays primarily focus on the trajectory estimation based on the last known position and speed, rather than providing a wide-area view of radar returns. Tactical navigation displays are designed more for route plotting and navigation management, not specifically for surround radar visualization. Thus, the PPI uniquely fulfills the requirement of showing the environment around the radar origin, making it the most suitable choice in this context.