A pattern of three shots is the most common method of signaling used
by hunters. However, three shots too close together aren't going to
get anyone's attention; they will just think the first two shots merely
missed the target. Therefore, it is a good idea to separate the shots
by about 3 to 5 seconds. Any longer than that and the listener will
not recognize it as a distress signal. The best time to use this method
is after dark because hunting is illegal during this time, so other
hunters or officials will be more alert to such activities.
Horns, and Other Sound-Emitting Devices-
A shrill, police-like whistle is a good device to use because of its
piercing sound which will travel great distances. This whistle should
be packed in your survival kit. A freon or compressed air horn is very
loud and would be heard at greater distances than the whistle. An automobile
horn can also be used in an emergency situation. Again, all those signals
should be sounded in a pattern of three blasts.