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Today, thanks to global navigational satellite systems such as GPS, every measurement is part of a master global coordinate system.

The solution, Mr. Zilkoski decided, might be to use the global navigational satellite system technologies, such as GPS, that were then beginning to proliferate.

In fact, GPS isn't the only global navigational satellite system.

Derived from local aviation maps and regulations, these use GPS and other navigational satellite signals to restrict the heights at which the craft can fly and to block its access to no-fly zones.

The system uses GPS and other navigational satellite signals to prevent drones from flying near these sensitive locations or high-profile events.