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Vessels near Strait of Hormuz transmit unusual messages to prevent attacks

Published by Global Banking & Finance Review

Posted on June 26, 2025

3 min read

· Last updated: January 23, 2026

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Vessels near Strait of Hormuz transmit unusual messages to prevent attacks
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By Georgina McCartney and Arathy Somasekhar HOUSTON (Reuters) -Vessels near the Strait of Hormuz have been broadcasting unusual messages concerning nationality in a bid to avoid being attacked as

Vessels Near Strait of Hormuz Broadcast Unique Messages to Avoid Attacks

By Georgina McCartney and Arathy Somasekhar

HOUSTON (Reuters) -Vessels near the Strait of Hormuz have been broadcasting unusual messages concerning nationality in a bid to avoid being attacked as doubts linger over the ceasefire between Israel and Iran, according to maritime risk analytics firm Windward and ship tracking data on Thursday.

The signals have been used since conflict broke out between Israel and Iran early this month, which led the U.S. to strike Iranian nuclear sites.

U.S. President Donald Trump brokered a ceasefire after 12 days of war but the maritime threat remains elevated, the Joint Maritime Information Center (JMIC) said.

"The perception among shipowners is that due to the convoluted nature of shipping it’s hard to know or ascertain clearly a chain of ownership to nationalities which may be under higher threat in shipping, namely the UK, U.S. and Israel," said Ami Daniel, chief executive officer of Windward.

Fifty-five vessels transmitted 101 atypical messages across the Gulf and Red Sea from June 12-24, Windward said, including "China owned" and "Russian crude", in the hope of preventing attacks because those countries are less likely to be targeted than Western ships.

Commercial maritime traffic surged 30% on June 24, the day after the ceasefire, according to the JMIC. Roughly a fifth of the world's fuel and oil consumption moves through the Strait of Hormuz.

Vessels typically broadcast their destinations or say "For Orders". Occasionally, vessels also transmit messages such as "Armed Guards on Board" to deter pirates or other attacks.

Unusual messages were almost only seen in the Red Sea before June 12, said Windward's Daniel. The Red Sea had been the focus of a series of attacks by Houthi rebels since the Israel-Gaza war broke out.

"I've never seen it in the Persian Gulf," Daniel said.

Panama-flagged container ship Yuan Xiang Fa Zhan, bound for Pakistan, was broadcasting "PKKHI all Chinese" on Thursday as it crossed the Strait of Hormuz, according to LSEG data.

China-flagged supertanker Yuan Yang Hu was broadcasting "Chinese ship" on Thursday morning while crossing the Strait of Hormuz. Carrying crude oil from Saudi Arabia to China, the signal changed to "CN NBG", the Chinese Port of Ningbo-Zhoushan, once the vessel had cleared the Strait.

Singapore-flagged container ship Kota Cabar was signalling "Vsl no link Israel" as it sailed through the Red Sea.

JMIC also warned of electronic interference in the region affecting Global Navigation Satellite System (GNSS). 

A jammed GNSS can cause ships to go off course, increasing the risk of collision with other vessels or obstacles. 

(Reporting by Georgina McCartney and Arathy Somasekhar in Houston, Lisa Baertlein in Los Angeles; Editing by Liz Hampton and Ed Osmond)

Key Takeaways

  • Vessels near the Strait of Hormuz are sending unusual messages to avoid attacks.
  • These messages are linked to the Israel-Iran conflict.
  • The U.S. brokered a ceasefire, but risks remain high.
  • Commercial traffic surged after the ceasefire.
  • GNSS interference poses additional risks in the region.

Frequently Asked Questions

What unusual messages are vessels broadcasting?
Vessels near the Strait of Hormuz have been broadcasting messages indicating their nationality, such as 'China owned' and 'Russian crude', to avoid attacks.
What triggered the increase in maritime traffic?
Commercial maritime traffic surged 30% on June 24, the day after a ceasefire was brokered following 12 days of conflict between Israel and Iran.
What are the risks associated with GNSS interference?
JMIC warned that electronic interference affecting the Global Navigation Satellite System (GNSS) could cause ships to go off course, increasing the risk of collisions.
How has the conflict affected shipping operations?
The ongoing conflict has led shipowners to broadcast atypical messages to clarify ownership and nationality, as the maritime threat remains elevated despite the ceasefire.
What was the focus of attacks before June 12?
Before June 12, unusual messages were primarily seen in the Red Sea, where Houthi rebels had been targeting vessels amid the Israel-Gaza war.

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