AIS: the signal behind every “real time” map”
When you open VesselFinder and you see a ship moving on a map, you are looking mostly AIS (Automatic Identification System) data. AIS is a system that transmits information useful for navigation via VHF radio: a “static” part (identity and characteristics of the vessel) and a “dynamic” part (GPS position, course, speed). It was created to increase safety and make the traffic situation at sea clearer, reducing the risk of collisions.
Precisely because this data can end up online, the IMO (International Maritime Organisation) also drew attention to the fact that the indiscriminate publication of AIS information on the web can have safety and security implications, especially in sensitive contexts.
What VesselFinder does, in practice
VesselFinder è a ship tracker which organises AIS signals and makes them searchable by ship name or identifier. The real value is not just the map, but the unit card. It allows you to correctly recognise a ship, distinguish homonyms and read data such as course, speed and position updates.
In other words, a service similar to that of Flightradar24, but with the sea instead of the skies. A common mistake is to expect a continuous signal everywhere. Coastal AIS depends on antenna coverage, so near the coast is more reliable. On the open sea, holes or less frequent updates may appear. In these cases, it is not necessarily the case that the ship disappears: often only the quality of reception and the chain that carries the data to the map change.
In addition, a ship can actually disappear if it chooses to switch off the on-board systems (such as the transponder or the AIS itself). This practice is only used by ships with illicit purposes or that otherwise wish to conceal their movements, making navigation more risky. What it has done, for example, in recent hours the Russian ship Sparta IV, a ro-ro (roll-on/roll-off) freighter specialising in transport of military vehicles and ammunition, operated by the company Oboronlogistics, a subsidiary of the Russian Ministry of Defence.
The press is covering this because the ship was stationed a short distance from Sardinia, with pendulum manoeuvres that seemed suspicious and whose intentions are still unknown. The news was given by the website ItaMilRadar, an aggregator of data on military aircraft and vessels in the Mediterranean, which retrieves information from services such as VesselFinder.
From map to data: API, history and planning
When tracking becomes work, structured data access comes into play. VesselFinder offers API services for credit to obtain locations and travel information in JSON format, with cost logic linked to the returned records. APIs are digital bridges that allow two different pieces of software to communicate and exchange data easily and securely.
In the same vein, practical guides are circulating on the net explaining how to query typical endpoints (search by IMO, by name or by geographic area, retrieve current route) to link data to navigation systems or dashboards.
When this competence becomes a profession
These services are much more than a tool for press and onlookers, they are real professional aids for workers at various levels. Using traffic, ETAs, routes and constraints to support terminal and port choices is one example. It is the perimeter of figures such as ship planner and yard planner, working on ship planning techniques, yard stowage planning, efficiency KPIs, operating procedures and knowledge of software to process the embarkation and disembarkation sequence.
