Where the two AIS fixes sit
The two public AMSA positions are screening evidence, not named-ship identities. H01W marks the hydrophone array centroid.
P1
Dominant passenger
The frozen comparison-screening contrast and the measured contrasts are positive at both frequencies. The direction test is not informative.
Measured contrast · positive at both frequenciesDirection · indeterminate
Frozen screen and measured changes
Bars show higher minus lower. A bar left of zero is a reversal. The first row reproduces the frozen cohort's RAM-labelled screening estimate; it is not an accepted RAM one-to-one result. The other rows are measured.
Vessel inputs & frozen estimates
Higher exposure
Passenger Vessel
- UTC
- 2026-02-15 00:04:58 UTC
- Ship
- 285 m · 18.7 kn
- Frozen band source level
- 186.1 / 187.0 dB re 1 µPa m (63 / 80 Hz)
- Frozen RAM-labelled TL
- 92.3 / 98.1 dB (63 / 80 Hz)
- Frozen band RL
- 93.8 / 88.9 dB re 1 µPa (63 / 80 Hz)
- Comparison scope
- This frozen comparison does not use the later one-to-one RAM results.
- Separate fast TL band screen
- TL 87.8 dB · RL 98.4 / 99.3 dB re 1 µPa (63 / 80 Hz)
- Pair record
- ha01-au-v1-0617b40b67b69460201b9d1b
- Full AIS record
- ha01-full-au-v1-b3a905349278b27e8f89fb8a
Matched lower exposure
Passenger Vessel
- UTC
- 2026-02-15 01:04:58 UTC
- Ship
- 285 m · 18.8 kn
- Frozen band source level
- 186.3 / 187.2 dB re 1 µPa m (63 / 80 Hz)
- Frozen RAM-labelled TL
- 101.2 / 102.9 dB (63 / 80 Hz)
- Frozen band RL
- 85.1 / 84.3 dB re 1 µPa (63 / 80 Hz)
- Comparison scope
- This frozen comparison does not use the later one-to-one RAM results.
- Separate fast TL band screen
- TL 88.2 dB · RL 98.1 / 99.0 dB re 1 µPa (63 / 80 Hz)
- Pair record
- ha01-au-v1-86921f363edd4ff7287e3381
- Full AIS record
- ha01-full-au-v1-867a156da6a149dc0339d301
Context & definitions
Comparison
Every higher/lower pair
4 pairs3 have positive measured contrasts at both frequencies0 pass the direction check