The warning, which was issued Wednesday, listed a series of incidents involving Iran since May, including Iran’s seizure of the United Kingdom-flagged M/V STENA IMPERO and the detention and subsequent release of the Liberian-flagged M/V MESDAR.
It said that during “at least two” recent encounters involving Iranian military forces, “vessels reported GPS interference. One vessel reportedly shut off its Automatic Identification System (AIS) before it was seized, complicating response efforts.”
“Vessels have also reported spoofed bridge-to-bridge communications from unknown entities falsely claiming to be US or coalition warships,” the warning added.
US Central Command, which oversees US military operations in the region, issued a statement Wednesday saying, “Vessels have reported GPS interference, bridge-to-bridge communications spoofing, and/or other communications jamming with little to no warning.”
“The U.S. remains committed to working with allies and regional partners to safeguard the freedom of navigation, the free flow of commerce, and the protection of U.S. vessels and personnel in this region,” the statement added.
A US defense official told CNN that Iran has placed GPS jammers on Iran-controlled Abu Musa Island, which lies in the Persian Gulf close to the entrance of the Strait of Hormuz.
The official said that Iran had placed the jammers at that location in an attempt to disrupt civilian aircraft and ship navigation systems, hoping ships or planes will mistakenly wander into Iranian waters or airspace while their GPS systems were not functioning properly, giving Iranian forces the pretext needed to seize them.
The official said the Iranian jammers have no effect on US military warships and aircraft.
The official said that Iranian military boats have been “spoofing” the automatic identification system merchant ships use to report and disguise their vessels as merchant ships instead of Islamic Revolutionary Guard Corps or Iranian Navy vessels.
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