What characteristic differentiates PPI scopes from other types of radar displays?

The characteristic that differentiates PPI (Plan Position Indicator) scopes from other types of radar displays is that they show a full-circle view. PPI displays represent radar returns in a two-dimensional format where the area around the radar is displayed as if viewed from above, creating a circular representation of targets relative to the radar's position. This enables users to visualize the environment surrounding the radar unit comprehensively and intuitively, making it easier to interpret data in a spatial context.

The circular layout allows for continuous monitoring of target movement and is particularly useful for maritime and aircraft applications, where knowing the azimuth and range of detected objects is crucial. This is in contrast to other radar display types, which may use linear or sectoral presentations that do not provide the same full-view advantage.