Editing Plan position indicator (section)

== Uses ==
[[Image:Radar2.gif|thumb|Simplified animation of a Plan Position Indicator radar display]]
The PPI is used in many domains involving display of range and positioning, especially in radars, including [[air traffic control]], ship navigation, [[weather radar|meteorology]], on board ships and aircraft etc. PPI displays are also used to display [[sonar]] data, especially in [[underwater warfare]].
However, because the speed of sound in water is very slow compared to microwaves in air, a sonar PPI has an expanding circle that starts with each transmitted "ping" of sound. In meteorology, a competing display system is the [[Constant Altitude Plan Position Indicator|CAPPI]] (Constant Altitude Plan Position Indicator) when a multi-angle scan is available.

Using computers to process data, modern [[sonar]] and [[lidar]] installations can mimic radar PPI displays too.<ref>{{cite web|url=http://www.radartutorial.eu/12.scopes/sc15.en.html |title=block diagram |publisher=Radartutorial.eu |access-date=2012-06-08}}</ref>