MARSEC (MARitime SECurity) is the three-tiered United States Coast Guard Maritime Security system designed to easily communicate to the Coast Guard and the maritime industry pre-planned scalable responses for credible threats. Its objective is to provide an assessment of possible terrorist activity within the maritime sectors of transportation, including threats to nautical facilities and vessels falling within the jurisdiction of the United States that could be targets of attack.
The Coast Guard originally created MARSEC to be compatible with, and respond in unison to the Department of Homeland Security’s (DHS) Homeland Security Advisory System (HSAS). With the introduction of the National Terrorism Advisory System (NTAS) to replace HSAS, the Commandant of the Coast Guard will adjust the MARSEC Level, if appropriate, based on any NTAS Alert issued by DHS.
Under the HSAS there were three levels to the system:
- Level 1 – Corresponding with the HSAS levels Green, Blue, or Yellow.
- Level 2 – Corresponding with the heightened HSAS risk coded Orange.
- Level 3 – Corresponding with the probable and imminent HSAS risk level coded Red.
The current levels are:
- Level 1 - minimum appropriate security measures shall be maintained at all times.
- Level 2 - appropriate additional protective security measures shall be maintained for a period of time as a result of heightened risk of a transportation security incident.
- Level 3 - further specific protective security measures shall be maintained for a limited period of time when a transportation security incident is probable, imminent, or has occurred, although it may not be possible to identify the specific target.
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- U.S. Coast Guard Maritime Security (MARSEC) Levels
- Sea Marshals (Maritime Security Provider)
- International Armour (Maritime Security Special Equipment)
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