CTBTO 2026Evidence & methods

AIS coverage

Sources

AMSA

Public Australian data, thinned to at most one anonymous AIS record per vessel per hour.

Coverage
Australia (HA01)
2025 January to 2026 July
Raw AIS records1
46,955,460
Within 200 km of H01W
159,925
AIS records2
97,549

ARA

Named vessel lists containing timestamped AIS records around four stations.

Coverage
HA01, HA03, HA08, and HA10
2026 August 11 to 25
Earlier HA10 data
2026 March 31 and April 1
Raw AIS records
13,736
AIS records2
5,080
The August lists overlap and sometimes repeat an unchanged record. We count each exact record once.

1 Sixteen AMSA downloads stop at 2 GiB. The truncated files do not contain their final 2,941,988 declared records (5.9%), so those records cannot be read from the downloads.

2 Unqualified “AIS records” means records that provide every field needed to estimate SL: a mapped ship class, same-record positive speed no greater than 50 kn, and positive length. Every AIS record receives SL and fast TL. The AMSA count is after the H01W 200 km boundary; ARA uses its delivered station-area boundary.

AIS records

HA01HA03HA08HA101,000 km
H01W200 km
AMSA records within 200 kmARA records near the station

Coverage

AIS
HA01
HA03
HA08
HA10
Full coveragePartial coverage

AIS record sets

Named AIS sets

The same nesting used by the interactive selector below.

How the AIS sets connect

Follow each record path from station through provider to RAM treatment.

AIS set relationshipsSix paths connect four stations with AMSA or ARA and RAM or non-RAM treatment. Juan and Highlighted are nested subsets.1 · STATION2 · PROVIDER3 · TREATMENTJuanHighlightedHA0198,100HA03333HA08932HA103,264AMSA97,549ARA5,080non-RAM88,565RAM14,064
102,629 AIS recordsSix complete paths. Select a ribbon to isolate it.
Juan contains 674 records: 609 non-RAM and 65 RAM. The Highlighted 21 sit inside Juan’s RAM path. Ribbon widths use square-root scaling; labels give exact counts.
HA01HA03HA08HA10

AIS records

Records
102,629
Stations
HA01, HA03, HA08, HA10
Calendar coverage
AMSA: 2025 January to 2026 July · ARA: 2026 March–April and August
SLComplete
TLComplete
Fast TLComplete
RAM14,064 / 102,629
One-to-one21 selected records
Sweep31 fields available
RLComplete
RAM frequencies (Hz; linear scale)
550100
Explore SL, fast TL, and RL / SPL for this set →

Explore maps and tables

Explore AIS records

Map all 102,629 AIS records and filter by station, provider, RAM treatment, or exact and reusable propagation coverage.

Juan's ranking tables

Search the four ranking tables over the same 674 SL-eligible records and switch between their ordering methods.

Data groups and coverage

See what the AMSA, ARA, GFW, and Juan data groups contain, where they apply, and how one record is defined.

ARA records by station and hydrophone array

Browse 13,736 distinct ARA records: 11,883 from 2026 August 11 to 25, plus the earlier HA10 data.

One closest observed AIS record per named vessel and hydrophone array; no interpolation or CPA estimation.

VesselTypeTime(UTC)Distance(km)RL @ 63 Hz*(dB re 1 µPa)RL @ 80 Hz*(dB re 1 µPa)
SEA DOLPHINTanker2026 August 12 16:26:4931.48 km——
NORD EAGLECargo2026 August 21 15:14:2459.61 km——
YASA VENUSCargo2026 August 24 15:56:2670.25 km——
ALCORCargo2026 August 12 16:28:2570.50 km——
CAPTAIN ANDREASCargo2026 August 11 11:35:2673.71 km——
GREAT AGILITYCargo2026 August 24 13:26:4875.38 km——
HOEGH AUSTRALISVehicles Carrier2026 August 13 13:19:0679.67 km76.8 dB73.9 dB
CANOPUS LEADERUnknown2026 August 25 16:01:2681.32 km——
APL SAVANNAHCargo2026 August 21 11:28:2681.59 km——
BELLE CONFIDENCECargo2026 August 21 13:30:0282.50 km——
FOREST VENUSCargo2026 August 14 12:42:1383.38 km74.4 dB71.1 dB
ZHE HAI 2Cargo2026 August 12 16:30:1287.58 km——

* JOMOPANS-ECHO band SL minus fast TL. This is a screening estimate, not a measured level or a RAM result.

Context & definitions

Explore the AIS data