Event

UNDER_REVIEW

Vessel-intelligence systems explain what a vessel may be doing. Marine Sentinel explains what that may mean for the connected environmental system.

PUBLIC_SAFEHISTORICAL_ONLYREPORTEDHISTORICAL_DATA

Public safe view · analyst-only sources are not attached. Permalink /event/nikoi-2025-04-29/

Event identity

SlickDetectionEvent / PollutionEvent

Time window: 2025-04-29
Location: Riau–Lingga / Singapore approaches (source claims disagree)
Geometry: 21 km · 11 km² · 1.934143°N, 104.934432°E
Source / method: Supplied incident report + related case materials · Source-reported geometry; AIS correlation in source materials (candidate)
Related vessels: POLARIS MMSI 477300300 (POTENTIAL_SOURCE)

POTENTIAL ENVIRONMENTAL RELEVANCE · confidence MODERATE

Source-reported marine anomaly 21 km / 11 km² on 29 Apr 2025.

East Bintan marine conservation area (SIDAKO T535) — in the wider system, not asserted as legal overlap until geometry check
Coral / seagrass / mangrove extent (habitat ≠ condition)
Tourism receptors (Nikoi / Cempedak context)
Shipping corridors (schematic)

Relevance is not harm. Candidate vessel association is not a confirmed source.

candidate-polaris → ev-ais-polaris supported_by
Source-linked evidence edge from the Nikoi case file
candidate-polaris → ev-incident-report spatial_temporal_context
Source-linked evidence edge from the Nikoi case file
nikoi-2025-04-29 → ev-incident-report observed_as
Source-linked evidence edge from the Nikoi case file
nikoi-2025-04-29 → ev-eez-claim jurisdiction_claim
Source-linked evidence edge from the Nikoi case file
nikoi-2025-04-29 → ev-location-claim-a jurisdiction_claim
Source-linked evidence edge from the Nikoi case file
ev-eez-claim → ev-location-claim-a disagrees_with
Source-linked evidence edge from the Nikoi case file

DetectionHIGH

ClassificationMODERATE

SpatialMODERATE

TemporalMODERATE

Vessel associationMODERATE

Causal attributionLOW

ModelUNKNOWN

Ecological consequenceMODERATE

Operational relevanceMODERATE

Overall intelligenceMODERATE

Why?

Source-assigned 100% detection certainty is retained as a claim, not re-labelled as system confirmation.
Vessel association confidence is separate from detection confidence.
Causal attribution remains low — association is not causation.
Location source claims disagree; spatial confidence is capped.

Retrieve licensed historical AIS and, if permitted, the observation-date SAR/optical scene. Do not treat live AISStream as that archive.

BLOCKED · Compare adjacent AIS tracks in the event window (licensed or public snapshot is not a 2025 archive)
Live AISStream snapshot is current, not a 29 Apr 2025 archive.
OPEN · Retrieve SAR / optical scene for the observation date if licence allows
Would corroborate geometry. Not performed in this public replay.
SATISFIED · Check MPA / habitat overlap against loaded SIDAKO and Atlas layers
SIDAKO T535 and coral/seagrass/mangrove layers are loaded as context.

AIS match: INSUFFICIENT DATA

NO MATCH is not asserted. This is not labelled a dark vessel. No Skylight or SAR vessel detection is available.

POTENTIAL SOURCE ≠ confirmed polluter. This event remains valid if vessel association is later refuted.

INTEGRATION PLANNED · Skylight / Allen Institute for AI — Potential upstream event provider / reference architecture
TECHNICAL REFERENCE · Allen Institute for AI — Technical reference before any duplicate generic vessel-behaviour ML
INTEGRATED · AISStream — Public terrestrial AIS snapshot for Singapore–Bintan approaches
REFERENCE · SkyTruth Cerulean — Slick detection lineage in the Nikoi historical case
LICENSE REQUIRED · Global Fishing Watch — Potential fishing-effort / presence provider