https://kahlenberg.co.uk/yacht-motorboat-superyacht-sound-signals/sound-signals-75m-200m/
Superyacht sound signals 75m-200m LOA - Kahlenberg UK
Nov 25, 2020 - For larger superyachts we have the robust and sonorous four-series Chimetones in dual, triple and quadruple projector formats.
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https://www.tunashipping.com/product-category/bridge-equipments/sound-signals/?lang=en
Sound Signals Archives - TUNA SHIP SUPPLY
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https://research.chalmers.se/en/publication/548395
Modelling the effects of a random medium on direct and refected sound signals from a moving source
Randomnesses in acoustic propagation conditions affect the signal at a receiver placed at a distance from the source. Without any refecting surface the random...