22MAY

GPS blacked out across Gulf chokepoints

2 min read

11:08UTC

US and British maritime authorities confirm an electronic warfare corridor stretching 2,500 kilometres across two of the world's three critical sea lanes. There is no safe detour.

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ConflictDeveloping

Key takeaway

An electronic warfare corridor now links two chokepoints, leaving no safe maritime alternative.

MARAD Advisory 2026-004 and UKMTO data confirm severe GNSS/GPS interference extending from the strait of Hormuz across The Gulf of Oman and into the Red Sea near Bab al-Mandeb ¹. This is not a side effect of military operations but a deliberate electronic denial zone spanning two of the world's three critical maritime chokepoints.

No modern peacetime precedent exists for electronic warfare denial at this scale. During the Tanker War (1987 to 1988), mines and missile boats threatened individual vessels. The current denial threatens the navigational infrastructure itself, degrading the ability of any vessel to determine its own position across a 2,500-kilometre corridor. The Houthis threatened Bab al-Mandeb closure the day after Pakistan confirmed talks had stalled.

Vessels diverting from Hormuz toward the Red Sea now navigate degraded positioning systems approaching a second contested chokepoint. Roughly 4.5 million barrels per day and 12% of global trade pass through Bab al-Mandeb. Combined with near-total Hormuz closure, the world's two most important oil chokepoints are under simultaneous pressure for the first time since the 1973 oil crisis ². The Cape of Good Hope route adds 10 to 14 days and $500,000 to $1 million per voyage in fuel costs.

Deep Analysis

In plain English

Ships navigate using GPS-style satellite signals. Someone is deliberately jamming those signals across a 2,500-kilometre corridor stretching from the Strait of Hormuz in the Gulf to the Bab al-Mandeb in the Red Sea. This matters because ships diverted away from Hormuz (which Iran controls) have been heading toward the Red Sea instead. The GNSS jamming makes that alternative route significantly more dangerous, because ships cannot accurately determine their own position. The practical effect: there is now no safe, insurable sea route between the Gulf and global markets. Ships must go around Africa instead, adding 10 to 14 days and significant fuel costs to every voyage.

Source Landscape

This story draws on neutral-leaning sources

Primary parallel: The Tanker War of 1987-88 saw Iran and Iraq attack vessels in The Gulf, leading to Operation Earnest Will — US Navy convoy protection through Hormuz. The threat was kinetic and localised. The current electronic denial operates across a 2,500-kilometre corridor simultaneously.

Counter-parallel: Operation Earnest Will succeeded because the threat was to individual vessels from mines and missiles, allowing convoy protection. There is no analogous response to a denial zone that degrades navigation infrastructure across two entire sea lanes.

The Cape of Good Hope detour adds 10 to 14 days and $500,000 to $1 million per voyage. Combined GNSS denial and the physical threat at both chokepoints effectively makes the Cape route the only commercially viable option for most carriers.

Insurance costs for Gulf and Red Sea transits have already risen sharply. The combined GNSS denial zone eliminates the risk-reduction argument that the Red Sea is a safer alternative to Hormuz.

Consensus view: RUSI maritime security researchers and Lloyd's List Intelligence assess the GNSS denial corridor as a layered access denial strategy: degrading navigation instrumentation reduces both commercial willingness to transit and the tactical effectiveness of any anti-IRGC naval operation.

Counter-view: The Turkish maritime authority UDHB and Chinese COSCO maritime risk analysts note that modern vessels carry inertial navigation backups and that the denial zone, while severe, does not render transit physically impossible — it increases risk and insurance cost rather than creating a hard barrier.

Key tension: Whether the GNSS denial zone is a direct precursor to kinetic action against vessels attempting the Red Sea detour, or a sustained electronic deterrent intended to raise costs without triggering a new military confrontation.

Sources:International Maritime Organisation / UKMTO·US Maritime Administration

Mentions:Strait of Hormuz →Pakistan →Iran →Bab al-Mandeb →Islamic Revolutionary Guard Corps (IRGC) →Houthis →UKMTO →

First Reported In

Update #51 · Iran hits aluminium plants; Hormuz emptying

International Maritime Organisation / UKMTO· 29 Mar 2026

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Causes and effects

Caused by

Houthis threaten to close Bab al-Mandeb

The GNSS denial zone extending to Bab al-Mandeb is the electronic precursor to the physical closure threatened by Houthi minister Mansour.

Occurred 28 Mar 2026

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This Event

GPS blacked out across Gulf chokepoints

The deliberate GNSS denial zone eliminates the Red Sea as an alternative to Hormuz, trapping commercial shipping between two contested chokepoints with degraded navigation systems.

Led to

Houthis threaten second chokepoint

GNSS denial across both chokepoints supports the coordinated Houthi-Iran electronic warfare enabling the sustained missile campaign against Israel.

Occurred 30 Mar 2026

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Different Perspectives

Islamabad (Pakistan Armed Forces and Foreign Ministry)

Munir's cancellation reflects Islamabad's assessment that no bridging formula survives the collision of Khamenei's uranium directive, Rubio's Hormuz red line, and the sequencing gap simultaneously; Naqvi's relay role signals continued Pakistani engagement without a mandate to close any of the three gaps.

Lloyd's of London war-risk market

Published PGSA coordinates give underwriters the cartographic input to model tanker route exposure inside the claimed zone; OFAC's Sunday GL V ruling determines whether Hengli-Singapore dollar-clearing routes carry secondary-sanctions risk from Monday, adding a compliance layer to the existing kinetic war-risk premium.

Hengaw Human Rights Organisation

Zaleh's trial lasted 'only a few minutes' before a conviction on PDKI membership charges at Naqadeh; the pattern of solitary detention, coerced confession, and minutes-long hearing is consistent with wartime political-charge architecture the organisation has documented across the Kurdish northwest.

Gulf Arab states (UAE, Bahrain, Kuwait)

The UAE has not published counter-coordinates to the PGSA's Hormuz zone map, leaving Emirati silence as the maritime-law response to Iran's charted boundary claim. Abu Dhabi's published position now defaults by omission toward implied acceptance of the zone's cartographic fact.

Beijing's Ministry of Commerce

MOFCOM's blocking order covers Hengli and four other designated refineries on the mainland but does not extend to the dollar-clearing layer in Singapore, making Sunday's GL V expiry the first live test of whether Beijing's sanctions-defiance architecture reaches the place where dollars settle.

The White House

Trump's verbal track on Iran has produced no signed Iran-specific presidential instrument across 84 days; both financial-sector EOs signed on 19 May are unrelated to Hormuz or the IRGC. Rubio's public naming of the Hormuz toll architecture as a deal-killer is the administration's most concrete new position this week.