Which frequency/mode is authorized for use internationally for Maritime Safety Information transmissions?

The correct choice for Maritime Safety Information transmissions is the frequency of 4209.5 kHz using FEC mode. This frequency is specifically allocated for the dissemination of safety information to maritime vessels and is recognized globally for its effectiveness in providing critical navigation, meteorological, and emergency messages.

FEC, or Forward Error Correction, is a robust method used in radio communications that improves the reliability of data transmission. By using error-correcting codes, FEC ensures that messages can be received correctly even in the presence of noise or interference, making it suitable for the important nature of maritime safety information.

Other frequencies or modes presented in the options may not align with international guidelines for safety transmissions. For example, simplex mode might not provide the reliability required for these urgent communications, which can affect the safety of navigation at sea. Therefore, the combination of 4209.5 kHz with FEC mode is the internationally recognized standard for Maritime Safety Information, underscoring its importance for ensuring the safety of maritime activities around the world.