Which frequency bands are primarily used for marine communication?

The correct choice recognizes that VHF (Very High Frequency) and MF (Medium Frequency) bands are indeed the primary frequency bands utilized for marine communication.

VHF is widely used in maritime settings for voice communication, particularly for ship-to-ship and ship-to-shore communications. It operates in the range of 30 to 300 MHz, providing clear and reliable communication within line-of-sight distances, which is essential for navigation safety and coordination between vessels and maritime authorities. VHF radios are mandatory on most vessels for safety and efficiency in communication.

MF, on the other hand, operates within the frequency range of 300 kHz to 3 MHz. It is commonly used for long-range communication, particularly for safety broadcasts and navigational notices. This band enables vessels to communicate effectively over greater distances, especially when VHF may fall short due to the curvature of the Earth, making it crucial for vessels operating farther from shore.

In contrast, HF (High Frequency) is also important for long-range communication but is not typically classified under primary marine communication frequencies for routine operations. UHF (Ultra High Frequency) is generally not used in the maritime context for vessel communications, which is primarily dedicated to aviation or military applications.

Thus, recognizing VHF and