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Greek Reporter (15 September 2025)

By John Koutroumpis

Greece and Türkiye are once again at odds in the Aegean after Ankara issued a NAVTEX announcing that its oceanographic vessel Piri Reis will conduct scientific surveys over the next ten days. The notice, broadcast as NAVTEX 0863/25 by Türkiye’s Izmir station, outlines a research route stretching west of Lesvos, south of Chios, and toward the islet of Kalogeros—located between Chios and Andros.

A NAVTEX (NAVigational TEleX) is an international automated system for broadcasting urgent maritime safety information to ships.

Although the Piri Reis is technically capable of carrying out such research, the move immediately raises questions of jurisdiction. Parts of the vessel’s declared route pass through Greek territorial waters and over Greece’s continental shelf—areas where Türkiye lacks authority to issue NAVTEX.

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