MarineCadastre (NOAA AIS)
Free & Open alternative data provider · 1 listed dataset
Datasets from MarineCadastre (NOAA AIS) (1)
MarineCadastre is a free, open U.S. government data hub for marine and coastal spatial data, catalogued for its publication of Automatic Identification System (AIS) vessel-tracking data. Its web presence, the Marine Cadastre Hub, is served at marinecadastre.gov and hub.marinecadastre.gov[1].
AIS is the international ship-tracking standard under which vessels broadcast their identity, position, course, and speed over VHF radio; the data is collected by shore stations and, since the mid-2000s, by satellites[2]. Open archives of this telemetry, such as MarineCadastre's, are used in vessel traffic studies, maritime security, and research on shipping activity.
What It Does
The Marine Cadastre Hub serves as an online portal for U.S. marine cadastre data, a domain that includes vessel movement records derived from AIS alongside coastal and ocean spatial datasets[1]. The resource is offered free of charge as government open data.
Data And Methodology
AIS is an automatic tracking system that uses transponders on ships and is used by vessel traffic services. AIS equipment reports a vessel's unique identification, position, course, and speed, integrating a standardized VHF transceiver with satellite positioning receivers[2].
Under the International Maritime Organization's SOLAS convention, AIS must be fitted aboard international voyaging ships of 300 or more gross tonnage and all passenger ships regardless of size. Signals are collected terrestrially, with a line-of-sight range of roughly 10 to 20 nautical miles from shore stations, and from space by low Earth orbit satellites, which augment but do not replace terrestrial reception[2].
Buyers And Use Cases
AIS data supports collision avoidance, fishing fleet monitoring, maritime security and domain awareness, search and rescue, and accident investigation[2]. Analysts also use AIS archives to study port congestion, trade flows, and vessel behavior; Wikipedia's overview notes applications ranging from ocean current estimation to the detection of sanctions evasion through AIS spoofing or transceiver switch-offs[2].
Because MarineCadastre distributes this data freely, it is commonly used where a no-cost historical record of U.S.-waters vessel movements is sufficient, complementing commercial AIS vendors.
Landscape
Commercial providers aggregate global AIS from satellite and shore-based receivers and sell real-time feeds and archive access, including satellite operators such as exactEarth, ORBCOMM, Spire Global, and HawkEye 360[2]. MarineCadastre occupies the open, government-published end of this spectrum. It sits alongside other U.S. federal open-data resources such as NOAA NCEI and SEC EDGAR.
Delivery And Pricing
The hub is a web application at hub.marinecadastre.gov; the site renders content dynamically and has been captured 1,851 times by the Internet Archive's Wayback Machine as of August 2026[3]. No paid tiers are associated with the government hub.
More datasets from MarineCadastre (NOAA AIS)
MarineCadastre (NOAA AIS) lists 1 datasets on this encyclopedia. The most representative listings:
More about Free & Open Data
Free & Open Data is one of the signal families covered by The Alternative Data Encyclopedia, with 36 providers and 322 datasets listed in the register. For how the signal is generated, its caveats and the compliance considerations, and the full provider list, see the category article.
Further reading
- How funds evaluate alternative data vendorsEvaluating alternative-data providers: research fit, provenance, historical timing, permitted use and the evidence needed for an informed purchasing decision.
- Open vs commercial alternative dataWhat free and open datasets can and cannot do: where public data rivals paid panels, where it cannot compete, and how open sources fit a professional research workflow.
- Alternative data for hedge fundsA practical guide to alternative data for hedge funds: team design, budget sequencing, infrastructure, vendor portfolio construction and the metrics that show whether the program creates investment value.
- Free alternative data sourcesThe practical list of free alternative-data sources for investors: public filings, official statistics, satellite and earth observation, on-chain data, web archives and open registries, what each covers, what it costs in engineering effort, and where free data falls short.