Similar to the previous question that turned up when I searched on this topic: Is there a standard set of light signals for mountaineers?, but for sound?
Repeating sets of 3 blasts is standard for distress. Freedom of the Hills mentions pre-arranging a communication system with your party (e.g., 1 blast = general "how are you" query; 2 blasts = "I'm fine"; 3 blasts = "Help!"). Any other common codes used for simple communication between separated members of a party?
The main thing that seems to be missing from the basic code outlined by Freedom is some clarification around the "I'm fine" response. "I'm fine; keep going" vs "I'm fine; wait for me". And from the group's perspective, telling the separated person to return vs continuing to forge their own path. Anyone know of or worked out a simple system for this sort of signal?
Granted, "don't get separated" is a good rule to follow, but things happen, so would be good to have a communication system in place.