Here is the organic AT Boundary Monument detector I used some time back. He was just in training at the time of the pictures. Turns out that oxidized aluminum has a pretty strong smell. View attachment 6312View attachment 6313
Fabulous. I have seen avy dogs at work. Hi tech folks have spent a ton of money developing a chemical "sniffer" that is not as sensitive as the nose of a dog, which just friggin grows naturally. Plus, the avy sniffer is still carried around by dead slow, virtually paralyzed human rescuers, whereas the dog has a more sensitive sensor, and can run three times as fast. Gotta love dogs!