What does the message "Security, security, security" signify?

The message "Security, security, security" is used to alert mariners to situations involving immediate safety concerns. This phrase indicates that there is a need for attention due to a threat to the safety of the vessel, crew, or passengers. It is a prioritized call that signals an urgent condition that may require action or a response from other vessels or agencies.

In maritime communication, specific phrases have distinct meanings, and "security" specifically brings to the forefront potential dangers that could affect safety on the water. Understanding the seriousness of this alert helps ensure that all parties involved can take appropriate actions to mitigate risks and maintain safety for everyone operating in the vicinity. Thus, the selection of this phrase directly correlates with immediate safety concerns rather than routine communications, non-emergency situations, or general navigation updates.