What Happened
- GPS interference at sea has reached alarming levels: Lloyd's List Intelligence recorded 1,735 GPS interference events affecting 655 vessels between early 2024 and March 2026, each event typically lasting three to four hours.
- The Strait of Hormuz — which handles roughly 20% of the world's oil and gas exports — has become a major flashpoint for GPS jamming, slowing marine traffic and creating navigational hazards.
- Vessel-tracking data has repeatedly revealed ships appearing in impossible locations — far inland or moving in perfect circles — hallmarks of spoofing attacks that feed false coordinates to onboard systems.
- Researchers at Georgia Tech have identified a growing gap between the sophistication of electronic warfare targeting civilian maritime navigation and the preparedness of ships' crews to detect and respond to it.
- The problem has intensified alongside conflicts in the Black Sea, Eastern Mediterranean, and Red Sea, where state and non-state actors deploy jamming and spoofing as tactical tools.
Static Topic Bridges
GPS and Global Navigation Satellite Systems (GNSS)
The Global Positioning System (GPS) is a US-owned and operated GNSS providing positioning, navigation, and timing (PNT) services globally. Ships, aircraft, precision agriculture, financial networks, and power grids depend on GNSS signals. Other major GNSS systems include Russia's GLONASS, the EU's Galileo, China's BeiDou, India's NavIC, and Japan's QZSS.
- GPS satellites orbit at approximately 20,200 km altitude in medium Earth orbit (MEO)
- GPS signals are extremely weak at Earth's surface (~10⁻¹⁶ watts), making them vulnerable to interference
- India's NavIC (Navigation with Indian Constellation) — formerly IRNSS — consists of 7 satellites covering India and ~1,500 km around its borders; it provides Standard Positioning Service (SPS) and Restricted Service (RS)
- International Maritime Organization (IMO) mandates GNSS receivers and AIS transponders on vessels above 300 gross tonnes under the SOLAS Convention
Connection to this news: The ubiquity of GPS in maritime navigation — and its inherent signal weakness — makes ships a prime target for electronic warfare, with strategic chokepoints like the Strait of Hormuz, Bab-el-Mandeb, and Malacca Strait particularly exposed.
GPS Jamming vs. GPS Spoofing
These are two distinct electronic warfare techniques with different mechanisms and consequences.
- Jamming: Broadcasts powerful radio-frequency noise on GPS frequencies (L1: 1575.42 MHz; L2: 1227.60 MHz), overpowering legitimate satellite signals so receivers simply cannot fix a position. Effect: navigation system shows "no signal."
- Spoofing: Transmits counterfeit satellite signals carefully crafted to mimic real GPS signals with false position/time data. Effect: receiver shows a confident but wrong position — far more dangerous than jamming because the crew may not realise the reading is false.
- Spoofing attacks are more sophisticated and require signal generators capable of replicating the GPS signal structure; increasingly feasible with commercial software-defined radios (SDRs)
- "Meaconing" is a related technique: capturing and re-broadcasting authentic signals with a delay to confuse receivers about position
Connection to this news: Spoofing is responsible for the "ghost ships" appearing inland on AIS — the ship's GPS receiver confidently reports a false position, which AIS broadcasts to the world, creating false vessel tracks.
Maritime Security and Critical Infrastructure
Maritime security encompasses the protection of sea lanes, ports, vessels, and undersea infrastructure (cables, pipelines) from threats including piracy, terrorism, smuggling, and electronic warfare. About 90% of global trade by volume moves by sea, making maritime disruption a direct economic and security concern.
- Key international frameworks: UNCLOS (UN Convention on the Law of the Sea, 1982); IMO's SOLAS Convention; ISPS Code (International Ship and Port Facility Security Code, post-9/11)
- AIS (Automatic Identification System): mandated by IMO for vessels >300 GT; broadcasts vessel ID, position, course, speed every 2–10 seconds — entirely dependent on GPS
- India's maritime security architecture includes: Indian Navy, Indian Coast Guard, National Maritime Authority (NMMA), Information Management and Analysis Centre (IMAC) at Gurugram (white-shipping data fusion), IFC-IOR (Information Fusion Centre for Indian Ocean Region) at Gurugram
- India's coastline: 7,516 km; 1,382 islands; 14 major ports handling ~95% of international trade by volume
Connection to this news: GPS spoofing at sea can paralyse AIS-based vessel monitoring, create false maritime pictures, and enable adversaries to blind coastal states to the true positions of ships — a direct threat to maritime domain awareness.
Electronic Warfare (EW) in Modern Conflict
Electronic warfare involves the use of the electromagnetic spectrum for military advantage — either exploiting an adversary's use of it (electronic attack) or protecting one's own (electronic protection). GNSS jamming and spoofing are now standard features of modern hybrid warfare.
- EW domains: Electronic Attack (EA), Electronic Protection (EP), Electronic Support (ES)
- Russia has deployed GPS jamming extensively around its military operations, affecting civil aviation and shipping in the Baltic, Black Sea, and Eastern Mediterranean
- Iran has been associated with GPS spoofing incidents in the Persian Gulf/Strait of Hormuz
- Countermeasures: anti-spoofing receivers; multi-frequency GNSS receivers; antenna arrays that reject low-angle signals; inertial navigation systems (INS) as backup; radar, AIS, and electronic chart cross-checks; encrypted military GPS (P(Y)-code and M-code)
Connection to this news: The conflict environments in Ukraine and the Middle East have effectively become live testing grounds for EW against civilian navigation infrastructure, with shipping bearing direct collateral consequences.
Key Facts & Data
- 1,735 GPS interference events affecting 655 ships recorded between early 2024 and March 2026 (Lloyd's List Intelligence)
- Strait of Hormuz handles ~20% of global oil and gas exports; Red Sea/Suez route handles ~12–15% of global trade
- GPS signal frequency: L1 = 1575.42 MHz (civil), L2 = 1227.60 MHz (military/dual-band)
- NavIC coverage: India + 1,500 km surrounding region; 7 operational satellites (3 GEO + 4 GSO)
- IMO SOLAS requires GNSS and AIS on vessels >300 gross tonnes
- Spoofing hallmark: ships appearing at inland locations or moving in circles on AIS tracking
- Anti-spoofing countermeasures: multi-constellation GNSS receivers; Receiver Autonomous Integrity Monitoring (RAIM); inertial navigation system (INS) backup
- India's IFC-IOR at Gurugram: monitors white shipping (commercial vessel tracking) across the Indian Ocean Region