What is the method of communication using Morse code called?

The method of communication using Morse code is correctly identified as wireless telegraphy. This is a technique that utilizes telegraphic signals to send messages through long distances without the need for wires, which was a significant advancement in communication technology. Wireless telegraphy allows for the transmission of Morse code, consisting of dots and dashes to represent letters and numbers, over radio waves. This method was particularly crucial in maritime communication and is historically significant as it enabled ships at sea to communicate distress signals and other important messages.

While other options may involve forms of communication, they do not specifically pertain to Morse code. Facsimile transmission refers to sending scanned printed material over a telephone line; radio wave transmission broadly encompasses various wireless communication methods but does not specifically indicate the use of Morse code. Direct messaging typically refers to sending messages through electronic platforms, often in a more contemporary context, and does not apply to Morse code communication methods. Thus, the distinction is clear in recognizing wireless telegraphy as the appropriate answer.