SIGNAL FLAGS

Romeo, Sierra, Tango and Uniform: Signal Flags and Meanings

Romeo, Sierra, Tango and Uniform form an unusual group: three carry clearly defined individual messages, but Romeo has no meaning of its own in the general single flag code. This does not make R superfluous. It remains a letter of the alphabet and appears in other signal contexts. The four patterns help to keep the character stock and assigned message cleanly apart.

Test your knowledge →

R–U Signal Flags: Meanings and Context · supplied learning collection

Key facts and distinctions

Article focus: International Code of Signals
Learning distinction: Sign, message and context are separate
Romeo: R; no general ICS single flag signing
Romeo model: Yellow upright cross on red
R with numerals: Distance in nautical miles
Sierra Sierra: S; reverse drive is used
Sierra model: Blue square on white
Tango: T; keeping clear when trawling with second vessel
Tango pattern: Red–white–blue, vertical
Uniform: U. Consignee is in danger
Uniform model: Red and White Quarters

Romeo: present, but without general individual notification

Romeo is a red flag with a yellow upright cross. In the general directory of ICS individual flag signals, R is not assigned a stand-alone message. This is positive information about the code and not a gap that should be filled by a plausible meaning. Historical lists in particular occasionally mention earlier interpretations that may not be adopted for a question about the current general single flag code.

The letter R can still occur within groups or together with numbers. The signal book assigns R with one or more digits to a distance indication in nautical miles. In addition, the method signal R has received the meaning in other transmission contexts. These two statements are not contradictory: a general single flag meaning, a supplemented group and a procedural signal are different categories.

Sierra and Tango: Propulsion and Common Fishing

Sierra shows a blue square on a white background. The individual signal S indicates the use of the reverse drive. This is more accurate than the unconditional statement that the ship is already going backwards. The propulsion effect and the actual movement of a ship are not conceptually identical. For a learning side, the precise designation of the drive state is sufficient; speed or distance traveled does not belong to the individual significance.

Tango carries three vertical fields in red, white and blue. T requires clearance because the vessel is involved in trawling with a second vessel. The participation of two vehicles belongs to the term pair trawling. A translation like I fish would be too general. The signal text makes the joint activity known, without providing a detailed description of the devices or a scheme for passing by.

Uniform: Danger for the addressed recipient

Uniform consists of red and white quarters. U warns the targeted recipient against being in danger. The reference is different here than with numerous flags that start with me and report their own condition. A reminder can therefore be the direction of the statement: U looks at a danger for the opposite, while S describes its own drive and T describes its own fishing activity.

The race rules use, among other things, Sierra and Uniform for other purposes. S can indicate a shortened path there, U refers to a special starting rule. These meanings come from the sporting rules and should not be side by side on an ICS learning card as alternative single translations. The comparison is helpful when it explicitly contrasts two systems; without this labelling, it would create additional ambiguity.

Details Worth Remembering

No single meaning is an answer

For Romeo, no individual general notification is the right answer. This does not mean that the flag is missing, nor that R never appears in a code. Such distinctions clearly make challenging flag issues solvable.

Drive is not speed

Sierra designates reverse drive. The code thus provides information about the operation of the ship without specifying its instantaneous speed. The exact wording preserves a factual distinction that is often lost in very short flag lists.

Two ships belong to Tango

Tango does not mean every form of fishing. Cooperation with a second vessel in trawling is the crucial addition. Those who learn this component can better distinguish T from the special network messages Golf and Zulu.