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<p>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. </p><p><a href="https://radionz.us6.list-manage.com/subscribe?u=211a938dcf3e634ba2427dde9&id=81ad21bafe">Sign up to the Our Changing World monthly newsletter</a> for episode backstories, science analysis and more.</p><p><strong>In this episode:</strong></p><p>01:30 At Mission Bay Beach Dr Tom Dowling demonstrates the device</p><p>03:40 In the University of Auckland’s Space Institute lab the team explain the device design, and how it works.</p><p>10:00 Dr Tom Dowling talks about the radar reflector trials in Campbell Island and Omaha beach</p><p>13:00 Dr David Galligan, director of Defence Science ...