Destruction of Navigation Aids South of Hormuz Raises Concerns Amid US Naval Blockade
Key Facts
An unnamed Iranian Revolutionary Guard Corps Navy official said navigation aids south of the Strait of Hormuz had been destroyed and that no unauthorized vessels had passed through the waterway overnight, Reuters reported. The statement places the destruction of the aids in the context of tighter restrictions on passage through the strait, but remains an account attributed to the Iranian official. The report gave no details about who destroyed the aids or the precise timing of the incident. The statement does not establish that oil tankers’ navigation systems failed or that four tankers were halted on 9 November. The developments come as the Associated Press says US forces have been enforcing a naval blockade on Iran for months in and around the strait.
Reuters quoted the official as saying: "Navigation aid systems south of the Strait of Hormuz have been destroyed, and no unauthorized vessels passed through the sea route overnight." The statement links the destruction of the navigation aids with the absence of unauthorized vessel traffic overnight, without giving a number of vessels or specifying a longer period. This means the no-passage announcement applies to that night, as stated in the quote, and does not provide a tally of maritime traffic on other days. The official did not say whether the destruction changed vessels’ routes or caused tankers to stop. This incident is separate from earlier reports of vessels being hit in the strait in October.
In its guidance for transiting the Strait of Hormuz, the UK Maritime Trade Operations agency warned that satellite navigation signals may not be reliable during passage. The agency said: "Global Navigation Satellite System positioning signals and their data feed to the electronic chart display system cannot be relied upon during transit." The guidance recommended independently verifying a vessel’s position if electronic interference is suspected. The recommendation is directly relevant to navigation through a waterway where an Iranian official said navigation aids had been destroyed in the southern section. But it is safety guidance issued on 20 May, not confirmation of the cause of the aids’ destruction or of interference in the latest incident.
Maritime tensions escalated in October, when the Associated Press said the month saw the highest number of attacks on commercial vessels in the Strait of Hormuz since March. The agency placed the attacks in the context of Iranian pressure on the United States to lift the naval blockade. In a separate report published on 30 October, the agency said the Revolutionary Guard had announced that four oil tankers were hit by mines and caught fire, including one carrying more than 2 million barrels of oil. That account concerns an earlier, separate incident from the 9 November report on navigation aids and overnight passage. The tanker numbers in the October report therefore are not a tally for the latest incident.
In an assessment published on 15 April, the Associated Press said navigation risks in the region had led to a more than 90% decline in vessel traffic. The figure appeared in its report on the US naval blockade and describes an earlier drop in vessel traffic, not a measure of transit during the night covered by the Iranian official’s statement. On the diplomatic front, the agency reported that US Vice President JD Vance said he and President Donald Trump had positive indications about the possibility of reaching a negotiated settlement, while indirect talks were under way. He was quoted as saying: "We both feel very good about the prospects of reaching a negotiated settlement." The statement did not set a date for an agreement, but expressed an assessment of the negotiating process while indirect talks continued.