You are faced with a few thousand hectares of rainforest that you know harbours one or more orangutans that you need to track down. All you have is a 2 second VHF ping from an implant that you can pickup from 100-400m.
Where, how, and why do you start looking? One way is to use a drone with a suitable radio payload..
Too long to paste the full background, but the source blog post can be found here:
Clip from one of the flights:
Source: DIY Drones
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