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Satellites and Drones

Across
Drone maintains position at fixed altitude and location.
Will reduce the need for radar aircraft tracking systems.
Feature that requires a drone to have GPS
Variation in known orbits require these from time to time.
Soviet Union system of satellites.
Down
Concept used to determine a position on the ground.
Each GPS satellite has 4 of these.
First letters of Global Positioning System
A concern related to GPS tracking capabilities
Beginner Drones