CTBTO 2026 · Highlighted RAM AIS records

21 AIS positions · 14 frequencies · 294 stored TL rows

TL methods compared for Highlighted RAM AIS records

Select an AIS position

Choose a numbered source position around the virtual receiver at the H01W hydrophone array centroid. Arrow keys move through the 21 positions after a marker has focus.

H01W

selected sourcevirtual receiver at the H01W hydrophone array centroidLongitude 113.78–115.05°E · latitude 34.46–35.26°S

SelectionJuan rank 1
Station · hydrophone arrayHA01 · H01W
Source UTC2025 October 4, 14:50:09 UTC
Exact range12.218 km
Conditional draught branch12.40 m · inferred reliable repeated stable

Transmission loss across frequency

RAM · 6 mRAM · 70% draughtTL-liteSpherical spreadingAinslie fast TL
Frequency (Hz)RAM 6 m (dB)RAM 70% draught (dB)TL-lite (dB)Spherical (dB)Ainslie fast TL (dB)
599.89796.69475.72981.78372.324
6.3100.77997.56875.72981.78372.324
8111.958108.79375.72981.78372.324
1096.69693.49175.72981.78372.324
12.5123.143120.02175.72981.78372.324
16103.426100.21675.72981.78372.324
2094.26291.10575.72981.78372.324
2587.42584.27775.72981.78372.324
31.595.92092.72275.72981.78372.324
4089.93686.86075.72981.78372.324
5088.78185.66575.72981.78372.324
6382.05879.13175.72981.78372.324
8096.53994.62875.72981.78372.324
10082.91880.26775.72981.78372.324

Interpretation boundary

RAM points, contextual screening lines

What selection changes

The map changes only the presentation. The underlying 294-row table and its scientific identity stay fixed.

Why RAM is shown as points

Each circle is one stored RAM value. The view does not interpolate between RAM frequencies.

Why two RAM depths appear

Six metres is required for every row. The 70%-draught branch appears only when available draught evidence supports it.

What the view cannot establish

The three quick estimates provide context and never fill RAM. Modeled TL is not measured sound, detection, contribution, attribution, or prediction.