AIS vessel tracking through Hormuz and the Gulf
How cooperative vessel reports support movement analysis, where ownership and cargo data come from, and why a missing ship is not proof of a closed route.
Open the live mapAIS is a cooperative broadcast
Automatic Identification System messages can include vessel identity, position, course, speed, navigation status, destination, and voyage fields. Coastal and satellite receivers collect those broadcasts, but availability depends on equipment, reception, message type, provider coverage, and sharing agreements.
A marker is an observation, not a guarantee that every displayed field is current. Destination and draught may be entered manually and can remain stale. Vessel names and identifiers should be checked against stable MMSI and IMO records where available.
How a Hormuz crossing is detected
SkyWatch records accepted points around a defined inner Gulf area and an outer Gulf of Oman area. A confirmed outward transition requires a vessel to be observed on the inside and later on the outside in a plausible order and time window. One isolated point is not enough.
This method answers a narrow question: whether public AIS observations support a crossing. It does not count vessels that never transmit, are outside provider coverage, or cannot be linked reliably across the boundary.
Avoiding false crossings
Duplicate messages, delayed batches, identity collisions, test transmitters, implausible speeds, and points that jump across land can create false transitions. The flow detector uses ordering, geography, time limits, and stable vessel identity to reject weak candidates.
A daily bulletin should process a completed day rather than the first minutes of a new one. Late observations can still change a historical count, so SkyWatch keeps the evidence trail and distinguishes a provisional live view from a completed-day summary.
Ownership, operator, and cargo are separate questions
The company that owns a vessel, the company that operates it, the flag state, the charterer, and the beneficial owner may all be different. Public vessel registries and commercial databases vary in coverage and update speed. SkyWatch links to external vessel records where useful but does not present an absent field as certainty.
Cargo is even harder. AIS voyage text may describe destination or draught, not the actual cargo manifest. A vessel class can suggest what it is designed to carry, but it cannot prove the contents of a particular voyage.
What the data can say about closure claims
Fresh confirmed outward crossings are inconsistent with an absolute claim that no vessel can leave. Zero observed crossings, however, does not prove closure because reception and transmission can be incomplete.
The careful conclusion reports the observation count, window, coverage status, and uncertainty. Legal access, official closure, navigational risk, and commercial willingness to transit are different questions that require additional sources.