Rnz: Our Changing World

New Zealand’s marine search and rescue region stretches from Antarctica to north of Samoa. If someone goes missing without any means of communication, that’s a lot of ocean to search. Now researchers and the New Zealand Defence Force have teamed up to develop and test a low-tech, no-battery device that can be picked up by radar – including that beamed down by satellites orbiting Earth. Sign up to the Our Changing World monthly newsletter for episode backstories, science analysis and more.In this episode:01:30 At Mission Bay Beach Dr Tom Dowling demonstrates the device03:40 In the University of Auckland’s Space Institute lab the team explain the device design, and how it works.10:00 Dr Tom Dowling talks about the radar reflector trials in Campbell Island and Omaha beach13:00 Dr David Galligan, director of Defence Science and Technology on why DST is interested in the device19:00 The satellites are the second side of the equation. Dr Tom Dowling explains how that works.20:50 Back at Mission Bay Beach Dr Tom Dow