Which type of radio operation is part of GMDSS?

GMDSS, or the Global Maritime Distress and Safety System, is designed to enhance the safety of ships at sea by providing a framework for emergency communications. It incorporates several types of radio operations to ensure comprehensive coverage and reliability in distress situations. The inclusion of MF (Medium Frequency), HF (High Frequency), and VHF (Very High Frequency) in GMDSS is crucial, as each frequency band has specific characteristics suitable for different environments.

MF is primarily used for long-range communication over moderate distances, making it ideal for communication when ships are out of sight of land. HF allows for even longer-range communication and is especially valuable during emergencies when vessels may need to communicate over great distances where other forms of communication are unreliable. VHF is essential for short-range communication, typically useful for ship-to-ship and ship-to-shore transmissions, particularly in coastal areas.

This combination of frequencies enables vessels to maintain contact under varying conditions and distances, fulfilling the primary goal of GMDSS to ensure that ships can effectively communicate distress signals and receive assistance when needed. In contrast, options that include only UHF, microwave, or AM only do not provide the necessary range and versatility required for effective distress communication at sea, making them unsuitable within the GMD