“…Though to implement some of these preventative technologies, it is, of course, necessary that the relevant drones have navigation technologies installed to be acted upon by the countermeasures, which for a substantial number of retail drones is not the case. For those that do have navigation technology, research efforts are quite extensive into developing algorithms and programs to facilitate orderly inter-drone coordination like network registration processes ( Agron et al, 2019 ) incorporating obstacle detection, ( Zheng et al, 2016 ; Zhu et al, 2017 ; Choutri et al, 2019 ; Abdullah et al, 2019 ), separation processes and collision avoidance ( Tan et al, 2017 ; Nysetvold and Salmon, 2019 ) the impact of weather on drone performance ( Vural et al, 2019 ), completion of common tasks ( Zhuravska et al, 2018 ; Abraham et al, 2019 ; Fesenko et al, 2019 ; Zhu and Wen, 2019 ), inter-drone information security ( Abughalwa and Hasna, 2019 ) and operation in GPS poor areas ( Siva and Poellabauer, 2019 ), though many of these are conceptual and theoretical deployment (e.g. Kim and Kang, 2019 ).…”