Where the physics on this site comes from
Every figure in the dossier carries a source key, and every key resolves to one of the 5 entries below. The build fails on a dangling reference, so a number cannot reach a page without something to point at.
Design requirement
design-envelope The requirement the payload is built against: required range, operating conditions, and the adaptivity the instrument must provide without an operator in the loop. Every figure marked Reference against this key is a target the design has to meet, not a result it has produced.
Paper
mackenzie-1981 Nine-term equation for sound speed in the oceans. J. Acoust. Soc. Am. 70(3), 807–812. Drives the sound-speed figure on every screen.
thorp-1967 Analytic description of the low-frequency absorption coefficient in sea water. J. Acoust. Soc. Am. 42(1), 270. Used for the water-absorption term.
urick-1983 The active sonar equation the optimiser scores candidates against, and the scattering treatment for suspended sediment.
Our own work
seanergy-model The optimiser, physics and DSP that ship inside the app: ~470 candidate parameter sets scored against the active sonar equation each tick. Figures sourced here are model output, not bench measurements — no hardware has been in the water.
seanergy-model is cited for a great many figures on this site, and
it is not an external authority. It means "our model produced this, and no hardware was in
the water". That is exactly why the provenance pills exist — so a modelled number is never
mistaken for a measured one just because both are printed in the same typeface.