1919 AD–1921 AD
Hydrographic cooperation gains a permanent institution
Oceans, navigation & cartography · Hydrography & bathymetry · Institutions & standards
A conference of 24 nations agreed in London in 1919 to create a permanent body, and the International Hydrographic Bureau began work in Monaco in 1921. It sought to coordinate offices and standardize charts and documents; since 1970 it has operated under the International Hydrographic Organization convention.
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. docs.iho.int (opens in a new tab)
Source provenance and scope
- Publication date
- Pending verification: the source could not be accessed
- Bibliographic date checked
- 2026-09-23
The correspondence between this reference and individual claims has not yet been itemized.
- 2. ihr.iho.int (opens in a new tab)
Source provenance and scope
- Publication date
- Not identified in metadata; document review pending
- 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.