1922 AD–1925 AD
Echo sounding accelerates depth measurement
Oceans, navigation & cartography · Hydrography & bathymetry · Instruments & positioning
In 1922, USS Stewart crossed the Atlantic taking hundreds of depths with an acoustic echo sounder, and survey vessels adopted such equipment over the following years. Measuring sound-return time gradually displaced point-by-point lines and enabled denser seafloor profiles.
Precision, calendar, and review
- Start
- year · no uncertainty qualifier in this record
- End
- year · no uncertainty qualifier in this record
- Calendar and convention
- Historical-era years; the source calendar is not identified. No conversion of days is assumed.
- Year zero
- The scale goes from 1 BCE to 1 CE without year zero. Changing era names changes labels only.
- Documentary review
- Date not recorded
Reading the date: duration of a process.
Sources
- 1. oceanexplorer.noaa.gov (opens in a new tab)
Source provenance and scope
- Publication date
- 2012-03-15
- What this date describes
- The cited source or edition; it may postdate the historical event.
- Bibliographic date checked
- 2026-09-23
- Date evidence
- Declared in the cited source’s publisher metadata.
The correspondence between this reference and individual claims has not yet been itemized.
- 2. nauticalcharts.noaa.gov (opens in a new tab)
Source provenance and scope
- Publication date
- 2015-07-30
- What this date describes
- The cited source or edition; it may postdate the historical event.
- Bibliographic date checked
- 2026-09-23
The correspondence between this reference and individual claims has not yet been itemized.
This record is an editorial synthesis. Consult the sources to check claims and their limits. Chronological relationships alone do not establish causation.