"Known officially as a Remotely Piloted Aircraft System, the drone is fitted with a so-called gas 'sniffer' system that capable of measuring sulphur emissions by flying into the ship’s exhaust gas plume."
"Known officially as a Remotely Piloted Aircraft System, the drone is fitted with a so-called gas 'sniffer' system that capable of measuring sulphur emissions by flying into the ship’s exhaust gas plume."