Liberia Maritime Authority Marine Advisory 22/2025, the purpose of this marine advisory is to draw attention to recent navigational concerns raised by the Danish Maritime Authority regarding vessels conduct in the IMO adopted Traffic Separation Scheme (TSS) off Skagen, Denmark. Specifically, vessels have been observed transiting the inshore traffic zone without a valid operational justification, violating COLREG Rule 10(d)(i).

COLREG rule 10(d)(i)

“A vessel shall not use an inshore traffic zone when she can safely use the appropriate traffic lane within the adjacent traffic separation scheme. However, vessels of less than 20 m in length, sailing vessels, and vessels engaged in fishing may use the inshore traffic zones.”

Guidance

Shipowners, Operators, Masters, and Navigating Officers shall ensure compliance with COLREG, when approaching or transiting a TSS and:

• Avoid inshore traffic zones unless en route to or from a port, offshore installation or structure, pilot station, or any other place situated within the inshore traffic zone, or to avoid immediate danger.
• Chart and document any deviation with clear justification in the voyage plan.
• Maintain AIS transmissions and ensure route accuracy.
• Communicate with a VTS when approaching the area.
• Retain voyage plans and communication records for inspection if requested.

Compliance with Rule 10(d) is required for maintaining safe navigation in areas where traffic separation schemes are adopted and in busy waters to ensure the safety of all vessels involved. It intends to minimize the risk of collision with coastal shipping, thereby enhancing overall maritime safety.

For more information, please contact the Investigations Department at investigations@liscr.com.