Unreliable airprox data around the world.

Size Matters – Why so many airprox reports involving drones turn out to be inaccurate

Geofencing/ altitude limits prevent drones flying where they shouldn’t. What percentage of drones have this?

DJI drones feature geo-fencing and hard altitude limits.  This report by Skylogic Research shows that DJI drones account for 74% of drones in use:

Yuneec accounts for a further 5% – and their products also include geo-fencing technology and a 122m (400ft) hard limit.

Other brands make up the rest of the market in 1%, 2% and 3% chunks and are mostly toys incapable of reaching problematic altitudes.

Drone performance: can a drone even get to the altitudes where airproxes are frequently reported?