Meaning of plan position indicator

plan' posi'tion in"dicator

Pronunciation: [key]
  1. a radarscope on which an object reflecting radar waves shows its bearing and distance from the radar detector by causing a spot of light to appear on a screen that represents a map of the area around the detector. Abbr.: PPI
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.