What is Drone and how it works ?

Contrary to this belief, they are not like surveillance cameras because they take to the air. They fly, and can follow a person’s movements wherever they go.

Drone uses have expanded. Many civilians fly them these days. Modern ones like the DJI Phantom 3 or the Nano QX bring joy to many avid hobbyists.

Coast Guard Captain Chris Martino says the Coast Guard is currently restricted in its use of drones, and has to partner with the Navy to use theirs, but projects that integrating unmanned vehicles into the Coast Guard's array of tools will increase their surveillance of U.S. waters by 70%, meaning they'll catch (and prosecute) far more drug runners, among others.

The police often use aerial vehicles to survey backyards for marijuana. You may think that they need a warrant if they fly a drone below 400 feet.

The US Supreme Court has found that it is not a violation of constitutional rights to fly a drone at a low altitude. The ruling enables the police to use such devices to fight crime.

Drones have often been seen as automated weapons of war. But in recent years, hobbyists started buying smaller consumer drones for aerial photography, while companies used them to enhance or automate work processes

Using drone footage is not a violation of constitutional rights either. As long as an officer has the right to be at a crime scene, he can use the evidence he collects. The same applies to drones. The police can use the footage drones record, as long as it this is not done in a restricted area.

The global drone market could be worth $127 billion by 2020, up from just $2 billion today, according to consulting firm PWC

Contrary to what you may believe, achieving control of a drone’s pitch and yaw takes practice. Experienced pilots can make a drone dance in the air.

delivery, or aerial photography, the firm believes that drones will soon be used for verifying business claims, boosting crop yields, and creating special effects for Hollywood blockbusters.

7 million consumer and commercial drones could be shipped in the U.S. by 2020, compared to just 2.5 million in 2016, according to new FAA estimates. During that period, sales of small hobbyist drones are expected to rise from 1.9 million to 4.3 million, while sales of commercial drones could rise from 600,000 to 2.7 million.

Not all drones do. Drones help people in many ways. While some drones have military uses, others are used for photography and other purposes.

Lightweight drones like the Blade Nano QX or the Hubsan X4 cannot remain in the air for more than 10 minutes.

The U.S. is currently the world's largest drone market. Research firm KPCB's 2014 figures show that the U.S. controlled 35% of the drone market, compared to 30% for Europe, 15% for China, and 20% for the rest of the world.

Not all drones are mini-drones. The DJi Phantom drones can stay in the air for about half an hour. US military drones can hover for many hours at a time.

But 3 million drones could be flying in China by 2019, compared to just 390,000 shipments this year, according to IDC's forecasts. That's good news for drone companies like Shenzhen-based DJI Innovations, the biggest drone maker in the world.

There are more downsides than upsides to using drones

The first drones targeted terrorists

DJI Innovations is already worth $8 billion following its last round of funding last May. DJI hasn't disclosed how much revenue it generated in 2015, but it previously estimated that sales would double to $1 billion for the year. Its next round of funding could boost its valuation past $10 billion.

Apple (NASDAQ:AAPL) is one of DJI's biggest supporters. The tech giant recently gave DJI's new Phantom 4 drone "feature bay" displays, which were previously reserved for its own products, at over 400 of its brick-and-mortar stores

Military uses for drones are increasing

bad news for GoPro (NASDAQ:GPRO), which plans to release its first drone this holiday season to offset waning demand for its action cameras.

Attack drones need people to man them

4K drones now cost less than stand-alone action cameras. The cost of high-end drones is falling quickly, thanks to cheaper components and intense competition.

Israel was the first country to build drones