How do planes know their altitude?
There are several ways for an airplane to konw its altitude,including radar altimetry,inertial navigation, and GPS navigation.
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About GPS
GPS stands for global positioning system and is now found in most cell phones and is also available in dedicated handheld units. The major manufacturers of GPS systems are Garmin, TomTom, and Magellan.
About Airplane
An airplane is an aircraft that has fixed wings and propelled by propellers or jets. The first powered flight was accomplished the Wright brothers on December 17, 1903. Today, millions of passenger planes fly every year.
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