Airplane tracker is a job that involves the use of various technologies to track aircrafts. RADAR, Sonar and GEO are three of the most commonly used technologies for this purpose. RADAR is a system that uses radio waves to detect and locate objects. Sonar is a system that uses sound waves to detect and locate objects. GEO is a system that uses satellites to detect and locate objects. All three of these technologies are used in combination to accurately track airplanes.