Sécurité (pronounced say-cure-ee-tay) is a maritime radio call used to announce important safety information, such as navigational hazards or weather warnings. It is derived from the French word for "safety" and is the third, least-urgent level of maritime emergency communication, following "Mayday" and "Pan-Pan".

Purpose and Usage
Navigational Warnings: It is used to inform other vessels of dangers, such as floating debris, broken lightbuoys, or to announce a large ship’s entry into a narrow channel.

Weather Alerts: It is frequently used by coastguards to broadcast severe weather warnings.

Situational Awareness: It helps mariners maintain safety of navigation and situational awareness.

Radio Procedure
Call Setup: The call is broadcast on channel 16 (or 2182 kHz) to attract attention.

Method: The word "Sécurité" is transmitted three times: "Sécurité, Sécurité, Sécurité".

Message: Following the setup, the vessel typically switches to a working channel to provide the full details.

Precedence: It takes priority over normal traffic, but falls below Mayday and Pan-Pan in urgency.

Key Differences
Mayday: Grave and imminent danger (death, fire, sinking).

Pan-Pan: Urgent safety issue but not immediate danger (engine failure, medical issue).

Sécurité: Safety warning (weather, hazards).