Mark Jessop, VK5QI, is the lead for the Project Horus high-altitude ballooning group, a sub-group of the Amateur Radio Experimenters Group, located in Adelaide, South Australia. Project Horus has been launching high-altitude balloons since 2010, with approximately 60 launches so far. Mark is also one of the team that runs the SondeHub-Amateur HAB tracking website, in use by many ballooning groups around the world.