Which frequency is used by the international distress and safety framework for air and sea communications?

Which frequency is used by the international distress and safety framework for air and sea communications?

• A. 2182 kHz
• B. 121.5 MHz
• C. 156.8 MHz
• D. 243 MHz

Answer: (A)

The globally recognized distress and safety channel for long-range air and sea communications is 2182 kHz. This frequency sits in the MF band and is allocated for radiotelephony distress and safety in the maritime mobile service, with the ability to reach across oceans where VHF isn’t practical. Its long-range propagation makes it the reliable universal fallback for emergencies, allowing ships and aircraft to broadcast and receive distress and safety messages over great distances. Other options serve different purposes or operate in different bands. 121.5 MHz is an older airborne emergency frequency used primarily for aiding location and emergency signaling but isn’t the main international distress channel today. 156.8 MHz is Channel 16, the primary maritime calling and distress channel in the VHF band, useful near shorelines but limited by line-of-sight. 243 MHz is a UHF distress frequency used in military or specific contexts, not the civil international framework.

The globally recognized distress and safety channel for long-range air and sea communications is 2182 kHz. This frequency sits in the MF band and is allocated for radiotelephony distress and safety in the maritime mobile service, with the ability to reach across oceans where VHF isn’t practical. Its long-range propagation makes it the reliable universal fallback for emergencies, allowing ships and aircraft to broadcast and receive distress and safety messages over great distances.

Other options serve different purposes or operate in different bands. 121.5 MHz is an older airborne emergency frequency used primarily for aiding location and emergency signaling but isn’t the main international distress channel today. 156.8 MHz is Channel 16, the primary maritime calling and distress channel in the VHF band, useful near shorelines but limited by line-of-sight. 243 MHz is a UHF distress frequency used in military or specific contexts, not the civil international framework.