Quick answer
Echo is the International Code flag for E, identified by blue above red across a horizontal division. Used as a single-letter signal, it means “I am altering my course to starboard.” The Republic of Singapore Navy confirms this design and meaning in its official flag guide.
| Feature | Description | Evidence status |
|---|---|---|
| Letter and spoken name | E — Echo | International Code identification |
| Colour arrangement | Blue above red, divided horizontally | Confirmed by official naval guidance |
| Single-letter meaning | Announces the signalling vessel’s course alteration to starboard | International Code meaning |
| Overall proportions | No mandatory numerical ratio asserted | The reviewed evidence does not establish a manufacturing ratio |
| Exact colours | Blue and red; no numerical colour values asserted | No textile standard or authoritative digital colour specification established here |
| Manufacture | Dimensions, materials and tolerances unspecified in this record | No manufacturing specification verified |
Construction and reproduction
The identifying arrangement is a horizontal division with blue above red, as described in the Republic of Singapore Navy guide. This identification evidence does not establish exact panel dimensions, seam allowances or colour tolerances. Do not treat measurements taken from an illustration as an official construction standard.
Common manufacture has not been independently documented for this record. A screen rendering would be a colour approximation; any numerical drawing grid chosen without a manufacturing source would be an editorial reconstruction.
Historical context
The preface to Publication 102 records that the revised International Code was adopted by IMCO in 1965 and that the 1969 edition became effective on 1 April 1969. The consulted United States edition was revised in 2003 and lists E with its starboard-alteration meaning. These are milestones for the Code, not evidence of the first adoption date of Echo’s blue-over-red design.