Sound Signal Range
Estimate the audible range of a vessel sound signal from its whistle output level in decibels using two nautical miles above one hundred and thirty decibels, one nautical mile above one hundred and ten, and half a nautical mile otherwise.
Description
Estimate the audible range of a vessel sound signal from its whistle output level in decibels using two nautical miles above one hundred and thirty decibels, one nautical mile above one hundred and ten, and half a nautical mile otherwise.
Sound Signal Range is a focused tool for the following task. Estimate the audible range of a vessel sound signal from its whistle output level in decibels using two nautical miles above one hundred and thirty decibels, one nautical mile above one hundred and ten, and half a nautical mile otherwise. It reports Sound range from the values you provide rather than inventing measurements, coefficients, or professional judgment that are not part of the input.
When to use Sound Signal Range
Use this sailing calculation for planning or education when the vessel, units, reference directions, environmental conditions, and assumptions are explicitly known.
- Whistle loudness (dB)
- Required number in dB. Sound pressure level of the whistle at one metre.
The cited overview of Maritime safety supplies background for the terminology and domain context used by this tool.1
How Sound Signal Range works
Estimate the audible range of a vessel sound signal from its whistle output level in decibels using two nautical miles above one hundred and thirty decibels, one nautical mile above one hundred and ten, and half a nautical mile otherwise. Inputs are interpreted exactly in the displayed units and the calculation returns the following fields without presentation rounding.
- Sound range (NM)
- Returned number in NM. Approximate distance at which the signal can be heard.
Limitations and assumptions
- Vessel design and loading, sea state, wind, current, tide datum, weather, chart accuracy, equipment, crew, and safety margins can make real conditions differ from a simplified result.
- Whistle loudness must be at least 90.
- Whistle loudness must be no greater than 150.
- Use finite inputs in the displayed units, preserve source measurements and assumptions, and independently verify consequential decisions.
Alternative or Complementary approaches
Cross-check current charts, tide and weather services, instrument data, vessel manuals, and applicable navigation rules, and retain a conservative alternative plan.
References
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Maritime safety — Wikipedia contributors
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