“…An overview of key technologies enabling the development of systems using drones is described in [ 203 ]. While [ 152 ] describes the technological or regulatory challenges for UAVs, in [ 204 , 222 ], attention is drawn to the legal-political, socio-legal approach and the implementation of regulations, highlighting the measures that should be taken before making a given technology available to the public. Some of the important areas are planning paths, avoiding obstacles, and navigation [ 143 , 154 , 156 , 188 , 189 , 190 , 191 , 192 , 193 , 194 , 195 , 196 , 197 , 198 , 199 , 200 , 201 , 202 ].…”