I think in the future, this is what will happen.
I am just imagining when control on drone come to an extreme point.... it takes geo-fencing to a much higher level.
- All drones from XX weight and up, maybe 500 grams, must have a registered cellphone sim card installed.
- This sim card is linked to DJI geo fencing. If no sim card installed, drone can not take off or maybe can't even pair with the controller.
- If for some reason the drone user can by-pass geo-fencing and fly the drone, its internal geo fencing memory will still keep track and send data bits of flight track points ( GPS ) and its altitude to the controlling aviation authority of the said country , using the cell data service or even simple SMS/text if any violation occuring.
- If no cell service within a mapped cell coverage kept in drone memory, drone cant even take off, same as geo-fencing lock down.
- If no cell service and drone memory confirmed there is no mapped cell coverage, drone allowed to fly, example somewhere remote area or in the middle of the ocean.
- Every impact of the drone caused by collision or falling out of the sky ( accelerometer can trace this ), will be logged and sent out via cell service to authority as special data, on top of flight posititioning data. So if say a drone is reported to crash into a car on a highway, these logs can find the bad dude

. Computer is so powerful and cheap today, authority can do database search of 500 meter radius of reported crash and +- 120 minutes time period on any given day, in 2-3 seconds. Imagine credit card machine able to verify your credit card data with their server in just 3-4 seconds and there are probably 10,000 times more active credit card in circulation than all drones ever produced since the last 10 years.
- A small back up battery like how a clock is maintained on a PC is built into the drone, to allow at least 30 minutes of cell service for that sim card in the drone. This small battery keep getting charged by the main flight battery , without we knowing
Actually compulsory "vessel" tracking is not new.
Singapore, being one of the busiest shipping port in the world, has rules where even a small personal boat,
anything with engine, must carry a special transmitter. Yes, cheap small old dinghy with outboard has to comply too.
http://www.mpa.gov.sg/web/portal/ho...-craft/harbour-craft-transponder-system-harts
This is actually similar transmitter like an AIS transponder on any 300+ gross ton vessel as per IMO ruling and it is global compliance.
TYPES OF AUTOMATIC IDENTIFICATION SYSTEMS (PER ITU-R M.1371 AND IEC STANDARDS)
With a radar and AIS interface, authority can see all boats/ships that do not carry the transmitter.
Its very easy to get caught not operating this transmitter.
China made cellphone, simple one, is super cheap. US$20 only at retail.
To put a GSM cellphone chip on a drone of US$400 or more is not a $$ problem.
GPS data point at 1hz with altitude data is a small data package for a 25 minutes flight.
The annual licence to pay for the drone permit is what the government use to fund and operate the flight database program. US$75 a year, no one will deny it if the drone cost US$500 or more. No permit, no flying, that simple.
If I were to be the minister of X country, assigned by the government to be in charge for drone compliance,
I would do this. So well behaved pilots totally has nothing to fear and the bad ones will be tracked with ease.
If extra cost is an issue, then there is no need to do a hobby that wasted money in the first place
Of course hackers can by-pass all these, but government wants to look for the naughty boys.
If say a government goes 1 step further by using hardware finger printing, and is the one controlling special 256 bit password to first time activate any drone sold in that country, its not tough to enforce.
For those from UK, there is a law there, any air-rifle ( yes air-gun, not fire arm ) pumping more than 12 foot pound of power or air pistol 6 foot pound of power, will need Fire Arm Certificate, that is how a-n-a-l the UK control is. 12 foot pound is very low power. A 300 gram DJI spark at 40 KM/H speed hitting us is 14 foot pound of energy. A 9mm typical bullet is 344 foot pound of energy. A fast 100mph professional baseball pitch is said to be worth 103 foot pound
Airgun law in the UK
Imagine if authority allows you to own a drone, but they keep track of your drone flight to this extend, how would you response ?