What frequency range is typically used for Distress communications?

The frequency range typically used for distress communications in aviation and maritime contexts includes 121.5 MHz. This frequency is part of the VHF range and is designated as an emergency frequency for emergency locator transmitters (ELTs) in aircraft and can also be used for distress calls at sea. It is monitored continuously by Search and Rescue (SAR) services worldwide, ensuring that any distress signals transmitted on this frequency can be quickly identified and acted upon.

While other frequencies mentioned have their purposes, such as 406.0 MHz being a part of the satellite distress signaling system and used by ELTs as well, 121.5 MHz is specifically notable for initial distress communications. The 3-30 MHz range is primarily used for long-range communication including maritime and amateur radio, but not specifically earmarked for distress calls. 156.8 MHz is part of the VHF maritime band for routine communications and not designated solely for distress either. Thus, the choice of 121.5 MHz is suitable and recognized universally as a key emergency frequency.