What is the international distress frequency for voice communication?

The correct answer is 2182 kHz, which is recognized internationally as the distress frequency for voice communication in maritime contexts. This frequency is designated for use by ships to announce emergencies and to seek assistance from other vessels and coastal stations. The use of 2182 kHz ensures that distress calls can be received by a wide range of marine operators, providing a global standard for safety communication at sea.

The frequency operates in the medium frequency band, making it suitable for long-distance maritime communication, especially under conditions where other bands may not perform as effectively. Its establishment as a standardized distress frequency aids in coordinating responses to maritime emergencies, ensuring that those in distress can communicate their situation and receive help quickly.

In contrast, the other frequencies listed serve different purposes: 156.8 kHz is typically used for VHF maritime communications but is not the designated distress frequency; 406.025 MHz is primarily for satellite distress signals; and 121.5 MHz was historically used for aviation emergencies but is now largely phased out in favor of more efficient and modern communication methods. Understanding these distinctions is essential for effective communication in crisis situations.