What it is
An agreement between nations, not a specification
STANAG 3689 is the NATO Standardization Agreement by which NATO nations commit to implement AGeoP-25, Edition A, the Allied Publication that actually sets out the method for spelling place names on maps and charts. The STANAG itself carries no spelling rules: under "Agreement," "Participating nations agree to implement the following standard", and that publication is where the naming detail lives. Edition 6 of the STANAG, promulgated 1 October 2019, supersedes Edition 5.
Who commits, and how
The agreement binds NATO's participating (member) nations once they ratify it, and separately invites partner nations to adopt it. Ratification and implementation are tracked apart: nations are asked to examine their ratification and, where they have not already done so, tell the NATO Standardization Office their intention. A nation counts as having implemented the STANAG once it has issued instructions to spell place names in its mapping and charting in accordance with the agreement, and reports that implementation in line with AAP-03. National decisions on ratification and implementation are recorded in the NATO Standardization Document Database.
The STANAG names no supplier, contractor or company. It obliges nations, and a nation carries it out through its own mapping and charting agencies.
A phased correction, not a single cut-over
The agreement accepts that full implementation is not practicable all at once. Existing map and chart series are corrected progressively, "as far as possible on all scales together" until complete standardisation is achieved, so the STANAG describes an ongoing programme of correction across a nation's map and chart holdings rather than a single date every series has to meet.
Governance
The agreement sits under NATO's Military Committee Joint Standardization Board, through its Joint Geospatial Standards working group, and is reviewed in accordance with AAP-03, with the outcome recorded in the NATO Standardization Document Database. Its custodian nation is the United Kingdom. A nation or NATO body may propose a change at any time, for the tasking authority to process at the next review.
What it does not cover
STANAG 3689 sets out no place-name spelling rule, transliteration system or naming authority of its own; that detail sits entirely in AGeoP-25. It also names no assessment or certification scheme. The only check it describes is a nation issuing its own implementing instructions and reporting them.