DET-TECH-011 · Technical

Chronometer Programme

Published

12 November 2008

Last revised

2 June 2026

Type

Technical

Specification and civil oversight of public chronometers used in the measurement of drift.

The Chronometer Programme exists so that drift may be measured against a published tolerance.

Instruments are not oracles. They do not predict. They measure relation.

Public demonstration is permitted. Interpretation is not.

Civilian contractors may maintain an instrument. They may not vary the published tolerance.

Revision history

Version	Date	Note
1.0	12 November 2008	Programme opened.
2.1	2 June 2026	Instrument 13 annex updated.

Revision history is retained. Superseded editions are not destroyed.