Which of the following is NOT a function of a "Securite" call?

A "Securite" call serves a critical role in maritime communications, primarily focusing on safety information rather than distress situations. The primary functions of a "Securite" call include informing mariners about safety of navigation and delivering meteorological warnings. These messages are used to alert vessels of potential hazards, navigational concerns, or changing weather conditions that may affect safety at sea.

Indicating a distress situation, on the other hand, is the function of a "Mayday" call, which is specifically reserved for emergencies where life is at risk and immediate assistance is required. Therefore, understanding that "Securite" communications are focused on providing safety-related updates rather than responding to emergencies clarifies why options related to navigation updates or weather warnings are appropriate functions of a "Securite" call while distress indications are not.