What is the correct action to take in non-life-threatening situations at sea?

In non-life-threatening situations at sea, the appropriate action is to send a securite call. This type of communication is used to broadcast safety information to other vessels and is intended to provide important alerts regarding navigational hazards or other situations that may impact safety, but do not require immediate action akin to that of a distress call.

Using a securite call alerts other mariners in the vicinity to the situation and informs them of any necessary precautions they should take. This ensures that everyone is aware of potential issues without inducing panic or urgency as would happen with a mayday call, which is reserved for dire emergencies where someone's life is at stake.

Maintaining current course or increasing speed might not effectively communicate the situation to other vessels and could lead to confusion or danger if they are unaware of the non-emergency context. Therefore, sending a securite call is the most responsible and effective action in these circumstances.