Why can't we just subscribe to a commercial dark-vessel alert service instead of building our own satellites?

Commercial services such as those from HawkEye 360 or Spire provide fast time-to-value, but they log your queries, restrict data reuse, and can terminate or re-price contracts under commercial or geopolitical pressure. A sovereign constellation means you set the tasking priorities, retain the raw data, and are not dependent on a foreign company's continued willingness to serve you. For a coastal state with a contested EEZ, that independence is not optional.

What satellite technologies are combined to detect a vessel that has switched off its AIS?

Three layers are typically fused: synthetic aperture radar (SAR) detects vessel-sized metal objects regardless of daylight or weather; optical imagery from Planet-class microsatellites confirms vessel type and flag markings; and VHF AIS receivers on nanosatellites capture AIS pings that shore stations miss. Cross-referencing all three against a vessel registry exposes 'dark vessels' operating without a transmitted identity.

How small does a vessel have to be before it disappears from SAR imagery?

Modern commercial SAR satellites (ICEYE, Capella) operating in spotlight mode at ~0.5 m resolution can detect vessels of roughly 10–15 m length on calm seas. In higher sea states, clutter and wave returns can mask smaller craft. Artisanal fishing boats in the 5–8 m range — which account for a large share of unreported catch in coastal developing nations — remain reliably below the detection threshold without supplementary sensors.

What legal framework governs a nation's right to act on IUU detections inside and outside its EEZ?

Inside the EEZ, UNCLOS Articles 56 and 73 grant the coastal state full sovereign rights over fisheries resources and the right to board, inspect, and arrest violating vessels. On the high seas, enforcement is more constrained: UNCLOS Article 117 requires flag-state cooperation, and the FAO Port State Measures Agreement (PSMA) provides the primary multilateral tool — denying port access to vessels with IUU histories. Satellite evidence must be packaged in ways that satisfy these distinct legal regimes.

How quickly can satellite data be turned into an actionable intercept order?

End-to-end latency from satellite pass to analyst-ready alert currently ranges from about 30 minutes (for pre-tasked SAR in near-real-time pipelines) to several hours for routine optical analysis. Nations operating their own ground stations can cut downlink latency significantly. The operational constraint is rarely the satellite revisit; it is the human and computational processing pipeline — which is why investment in ground-segment AI analytics is as important as the space segment itself.

Can a small island developing state (SIDS) realistically afford a sovereign IUU detection constellation?

A nanosatellite constellation optimised for AIS reception and low-resolution optical imaging can be built and launched for under $50M at the small end, with operating costs well below $5M per year. Against an IUU economic loss figure that FAO estimates at tens of millions of dollars annually for mid-sized Pacific island EEZs, the return on investment is positive within a few years. Regional constellations shared among Pacific, Caribbean, or Indian Ocean island states through bodies like the Pacific Islands Forum further reduce per-country cost.

Does AIS-based detection work for fishing vessels required to carry AIS by IMO rules?

IMO SOLAS Chapter V requires AIS carriage on all vessels of 300 gross tonnes and above on international voyages, and on all passenger vessels. Most artisanal and smaller-scale commercial fishing boats are not captured by this mandate. Many flag states also have weak enforcement of AIS carriage on fishing vessels below the SOLAS threshold. Satellite-AIS therefore works well for large commercial fishing fleets but has structural blind spots for the artisanal sector, which requires complementary radar or optical approaches.

What is 'vessel spoofing' and how can it be detected from orbit?

AIS spoofing involves transmitting false position, identity, or vessel-type data — either to disguise a vessel's location or to create phantom vessels as decoys. Detection methods include comparing AIS-reported positions against SAR-detected physical positions, checking for physically impossible speeds or course changes between AIS pings, and cross-referencing multiple independent AIS receivers on different satellites to identify broadcast inconsistencies. HawkEye 360's RF geolocation constellation is specifically designed to geolocate the true transmit location of an AIS signal independently of the reported position.

4.2.1Live

Illegal Fishing Detection

Coast guard officers inspecting a fishing vessel at a port dock — Boats near a coastal city illustrate the busy maritime zones where satellite monitoring exposes illegal fishing activity.

Satellite Detection of Illegal Fishing Vessels

1
Radar Satellites
SAR imagery spots vessels day and night
2
Data Downlink
Raw SAR scenes transmitted to ground stations
3
AI Vessel Analysis
Algorithm flags ships dark to AIS tracking
4
Patrol Command
Authorities dispatch intercept vessels in real time

Radar satellites detect unlicensed vessels, AI cross-checks AIS data, and patrol commands receive actionable intercept alerts instantly.

Page in the build queue

This application has its place in the atlas. The full page — short and long descriptions, what-matters bullets, sovereignty rationale, and the eight-field architecture block — is being written next.

Maturity reading: Operational systems exist with paying customers. Phase 1 built §4.1 (Maritime Intelligence) end-to-end as the depth-and-format reference. Section 4 is the next section to graduate from scaffold to full content; the rest follow on the roadmap.

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4.2.2 · Next

Fishing Effort Mapping

Bring this into your sovereign programme.

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