If I have to do an urgent broadcast, what is it called?

When there is an urgent need to broadcast a message regarding the safety of a vessel or person, the term used is "Pan Pan Pan." This transmission is designated for situations that require immediate attention but do not pose an immediate threat to life, unlike a "Mayday," which indicates a life-threatening emergency.

"Pan Pan" alerts other vessels and maritime authorities that assistance may soon be needed but that the situation is not yet critical. It informs recipients that the broadcasting vessel has a high priority situation that they should be aware of, allowing them to respond as necessary without the escalated urgency of a Mayday call.

The other options serve different purposes: "Mayday" signals a grave and imminent danger; "Securite" relates to important safety information that may not be urgent but is crucial for navigation or safety; and "Urgent Alert" is a more general term that is not specifically recognized in radio communications. Therefore, in the context of urgent broadcasts where a vessel requires immediate assistance but is not in immediate life-threatening danger, "Pan Pan Pan" is the correct term to use.