Fox Hunting
Radio Directional Finding
In the Amateur Radio world, we use RDF to physically locate a transmitter. We use these skills for finding missing people, damaged/disabled vehicles, or problematic transmitters such as jammers or broken equipment (that's transmitting when it sh9ouldn't be).
When we do this for fun, which is also for training purposes, we call it 'Fox Hunting', and it's something that anybody can quickly learn to do!