The Islamic Revolutionary Guard Corps (IRGC) warned shipowners on Wednesday that any transit through the Strait of Hormuz established without coordination with Tehran is “unacceptable and dangerous.” This threat follows proposals for alternative southern routes, potentially complicating global oil flows despite a recent U.S.-Iran memorandum of understanding intended to reopen the waterway.
Why did the IRGC issue new warnings for shipowners?
The IRGC Navy informed shipowners via Iranian local media that only designated shipping routes are permitted for passage. The Navy stated that coordination with Iranian forces through specific communication channels is mandatory. According to the report, the IRGC warned that any movement outside these designated corridors is “highly dangerous and prohibited.”
This warning underscores Tehran’s intention to maintain authority over the Strait. It comes despite recent diplomatic efforts, including a memorandum of understanding signed last week between the U.S. and Iran to reopen the energy artery.
What alternative routes are being proposed for maritime traffic?
A naval information group proposed an alternative corridor on Saturday, suggesting shipowners use a southern route along Omani territorial waters. The notice stated this southern route has been confirmed clear of mines and serves as the recommended path for transit. The notice also advised shipowners to keep their transponder signals on while using this route.

The proposal creates a direct conflict with the IRGC’s instructions. While the naval group suggests the Omani route is safe, the IRGC maintains that any transit not coordinated through their specific channels is a violation of their designated corridors.
How has shipping traffic changed in the Strait?
Current data indicates a tentative recovery in vessel movement, though traffic remains below historical averages. Ship-tracking provider MarineTraffic reported that transits tripled to 93 last weekend compared to the previous comparable period. However, this volume still fails to reach the pre-war baseline of over 100 daily transits.
On Tuesday, MarineTraffic confirmed 31 verified crossings involving commercial and energy-laden vessels. The firm noted on Thursday that maritime operators are still moving cautiously rather than returning to normal traffic patterns.
Will Iranian control affect global energy prices?
Analysts suggest that if Tehran maintains operational influence over the waterway, global oil flows may never fully recover. Helima Croft, head of global commodity strategy at RBC Capital Markets, told clients in a Thursday note that any end to the conflict leaving Iran with operational control will likely result in “appreciably lower flows” through the strait.
The U.S. government has responded to Iranian maritime policies with sanctions. In May, the U.S. Treasury sanctioned Iran’s Persian Gulf Strait Authority, describing the entity as an attempt to “extort global maritime trade.”
Treasury Secretary Scott Bessent also issued a warning regarding maritime fees. Bessent stated that Washington will not tolerate any tolling system implemented on the Hormuz waterway and promised that his agency would aggressively target actors involved in such systems.
Frequently Asked Questions
Is the southern route through the Strait of Hormuz safe?
A naval information group has stated that the southern route along Omani territorial waters is confirmed clear of mines and is a recommended alternative.

What happens if a ship ignores IRGC instructions?
The IRGC Navy has warned that vessels ignoring their designated routes and coordination requirements face “unacceptable and dangerous” conditions, implying potential action against those vessels.
How many ships pass through the Strait of Hormuz daily?
While pre-war levels saw over 100 ships per day, recent data from MarineTraffic shows weekend transits around 93, with Tuesday seeing 31 verified crossings.
Stay updated on global maritime security. Do you think the new U.S.-Iran memorandum will stabilize oil prices, or will the IRGC’s warnings keep traffic low? Let us know your thoughts in the comments below or subscribe to our newsletter for daily industry insights.
