Rules released today by the US Federal Aviation Administration require registration of small unmanned aircraft weighing more than 250 grams (0.55 pounds) and less than 25 kilograms (55 pounds) including payloads such as on-board cameras.
The registration fee is USD 5, but in an effort to encourage people to register quickly, the FAA will waive the fee through January 20.
"Make no mistake: unmanned aircraft enthusiast are aviators, and with that title comes a great deal of responsibility," said US Transportation Secretary Anthony Foxx in a statement.
US authorities concerned about safety implications of drones announced plans earlier this year to require registration.
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For recreational drone pilots in the United States, the flight rules are clear: no higher than 400 feet (120 meters), always within sight and nowhere near an airport without prior permission.
Owners will be able to use a streamlined online registration system, using a unique identification number for each drone. The registration is valid for three years.