An article by Gary Mortimer of sUAS News demonstrates graphically how unregulated and unprofessional operations of UAS can create a threat to others.
The UAS industry cannot afford to have cowboy operators placing UAS operations in jeopardy through poorly managed applications of the technology.

One possible cause of the failure of this system is the lack of understanding of the affects of multi-path signals and signal reflection.

Thorough instruction in GPS theory should be required knowledge prior to operating in these environments.

See the entire video through the link below.