Which signal is used to indicate an emergency in Navy communications?

The signal "SOS" is universally recognized as an emergency distress signal in maritime communication, including within Navy communications. This signal is effectively used to convey an urgent need for assistance and is particularly notable for its distinctive Morse code representation: three dots, three dashes, and three dots. Its simplicity and clarity make it easily identifiable, even under challenging conditions, ensuring that the message is conveyed promptly and effectively to those monitoring radio frequencies.

While terms like "URGENT," "EMERG," and "HELP" do indicate the need for attention or assistance, they are not as universally recognized or standardized as "SOS." Each of these alternatives may serve particular purposes within various contexts of communication but do not carry the same immediate international recognition as "SOS," which is critical for successful emergency response in time-sensitive situations at sea. Consequently, "SOS" remains the definitive signal for emergencies in Navy communications.