Coast Guard Establishes Safety Zone Near St. Thomas Airport to Mitigate Aircraft Hazards

The United States Coast Guard has issued a final rule establishing a new safety zone in the navigable waters west of the Cyril E. King Airport in St. Thomas, U.S. Virgin Islands. This regulation, effective June 8, 2026, is designed to protect personnel, vessels, and the marine environment from the inherent dangers presented by low-flying aircraft operating near the airport's runway. Under the new rule, entry into this specified marine area will be prohibited unless explicitly authorized by the Captain of the Port, Sector San Juan, or their designated representative.

The Rationale Behind the Restriction

The primary impetus for this safety zone stems from the proximity of vessels to aircraft transiting between private port authority managed yellow buoys and the end of the St. Thomas Cyril E. King runway. The Coast Guard identified an immediate need to mitigate the risks associated with vessels operating directly beneath or very close to the flight path of low-flying aircraft during critical phases of flight. This area encompasses all navigable waters directly west of the airport's runway end. The inherent hazards include the potential for aircraft-vessel collision, the risk of debris from aircraft operations impacting vessels, or even the distraction and disorientation of mariners due to aircraft noise and proximity. By creating a controlled access zone, the Coast Guard aims to prevent such incidents and enhance overall safety for both air and marine traffic.

Regulatory Process and Public Input

This final rule follows a Notice of Proposed Rulemaking (NPRM) published on January 7, 2026. The Coast Guard solicited public comments during a period that concluded on February 6, 2026. Significantly, the agency received one public comment that directly influenced the final text of the regulation. The commenter pointed out that the initial proposed regulatory text defined the safety zone using only two GPS coordinates. In response, the Coast Guard agreed that a more precise definition was warranted to ensure clarity and accuracy for mariners. Consequently, the final rule now defines the safety zone as a closed polygon, using four specific GPS coordinates to completely enclose the restricted area. This change demonstrates the agency's responsiveness to public input and its commitment to providing clear and unambiguous navigational guidance, while not altering the actual geographic expanse of the intended safety zone.

Navigational Impact and Enforcement

The established safety zone will undoubtedly require mariners operating in the waters west of Cyril E. King Airport to adjust their transit plans. However, the Coast Guard has certified that the rule is not expected to have a significant economic impact on a substantial number of small entities. This assessment is based on the premise that vessel traffic will generally be able to safely transit around the newly designated zone. The restricted area itself is defined as navigable waters within approximately 400 yards from shore directly west of the airport's runway. The rule also includes provisions for vessels to request permission to enter the zone directly from the Captain of the Port or a designated representative via telephone or VHF-FM radio on channel 16. The Coast Guard will further issue Broadcast Notices to Mariners via VHF FM marine channel 16, ensuring that the maritime community is well-informed of the new regulations. Enforcement of the safety zone will be conducted at all times, with the Captain of the Port San Juan being assisted by Federal, State, and local agencies to ensure compliance.

Broader Implications for Maritime Safety

This action by the Coast Guard reflects an ongoing effort to manage the increasingly complex intersection of various modes of transportation, particularly in critical areas like busy airports adjacent to navigable waterways. The establishment of this safety zone highlights a proactive regulatory approach to potential hazards that might otherwise be overlooked until an incident occurs. It underscores the Coast Guard's mandate under 46 U.S.C. 70034 to protect personnel, vessels, and the marine environment. While specific to St. Thomas, this rule serves as a reminder of the dynamic nature of maritime regulations and the continuous need to adapt to evolving safety concerns, balancing navigational freedom with the imperative of preventing accidents in sensitive operational environments.