Yes, Morse code is still in use, but in a narrow set of radio services rather than everyday communication. The ITU lists its International Morse recommendation as in force. It is worth understanding as an encoding, though not as a fixed-width binary character set: it uses two kinds of marks, a dot and a dash, and its meaning depends just as much on how long each mark lasts and how long the silence around it lasts.
Is Morse code still used?
Yes, in specific radiocommunication services. ITU Recommendation M.1677-1, which covers International Morse code, was approved on 3 October 2009 and is listed by the ITU as in force. The recommendation states that Morse continues in some radiocommunication services, explicitly naming the amateur and amateur-satellite services. It describes use in mobile and fixed services as diminishing.
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Where Morse still appears
- Amateur and amateur-satellite radio. These are the services the ITU text names as continuing to use Morse.
- Maritime procedure. The ITU also lists Recommendation M.1170-1, “Morse telegraphy procedures in the maritime mobile service,” as in force. That confirms a published procedure exists. It does not show that Morse is routine in present-day maritime operations.
- Mobile and fixed services. The ITU describes use here as diminishing, so these should not be treated as a current everyday channel.
Where the standard came from
ITU’s history overview places Morse within the expansion of electrical telegraphy. It records that “In the United States, Samuel Morse used the new Morse code to send his first telegraph message in 1844.” International telegraph standardization followed as cross-border services needed common equipment and procedures.
Two dates need to be kept apart. The first telegraph message in 1844 marks the new code’s first use. It does not mark completion of the International standard that exists today. The ITU’s earlier text of Recommendation M.1677 is more specific about the historical span: its “considering” clause states that versions of the Morse code have been in use since 1844. Many Morse variants share that history, but the current International standard is the one defined by the 2009 recommendation. This article does not assign credit for the code’s development beyond what ITU’s statements support, because the development involved more than one person and the sources here do not settle the attribution.
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How Morse works: timing is part of the encoding
Each character is a sequence of dots (short marks) and dashes (long marks). What makes the system work is the relationship between mark lengths and silences. A decoder has to recover the boundaries of elements, characters, and words from timing, not just from the symbols themselves.
| Signal part | Duration (in units) | What it marks |
|---|---|---|
| Dot | 1 | Short mark |
| Dash | 3 | Long mark |
| Gap between elements of one character | 1 | Separates dots and dashes within a letter |
| Gap between characters | 3 | Ends one letter and begins the next |
| Gap between words | 7 | Ends a word |
Some examples show how the mapping works. E is a single dot, T is a single dash, A is dot-dash, N is dash-dot, and SOS is three dots, three dashes, and three dots. Each letter has its own length, which is why Morse is variable-length: the number of marks per character ranges from one for E and T to four or five for characters such as H or the punctuation marks.
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Why the gaps matter
Remove the timing and the sequence becomes ambiguous. Four dots in a row could be H, or S followed by E, or E followed by S, or I followed by I, or four separate E characters. Only the silence between characters and the duration of each mark resolve the reading. In practice, a decoder estimates the unit length from the signal and classifies each mark and gap against the 1-unit and 3-unit values. Real signals drift and vary, so the classification is tolerant rather than exact.
Is Morse code binary?
Partly, and the qualification matters. Morse has two mark types, and a developer can map a dot to 0 and a dash to 1 as a shorthand. But that mapping is only an analogy. A fixed-width binary encoding such as ASCII assigns every character the same number of bits, and the bits themselves carry the whole message. Morse characters differ in length, and the silences are part of the message. Two identical mark sequences can mean different things depending on how the gaps are timed.
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The standard source describes international radiocommunication characters and operating procedures. It does not present Morse as a computer-science encoding, and the analogy should be read that way.
Comparing Morse with a fixed-width character encoding
The table below sets out the design dimensions. It describes how each approach is built, not which performs better.
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| Dimension | International Morse | Fixed-width character encoding (for example, ASCII) |
|---|---|---|
| Representation | Dot and dash sequences of varying length | A fixed number of bits per character |
| Timing and silence | Part of the signal; gaps mark character and word boundaries | Not part of the character code; framing is handled by the transport |
| Decoding requirement | Timing recovery and boundary detection before symbols can be read | Fixed bit groups can be read directly once framing is known |
| Target channel | Radiocommunication, where a human or machine receives marks over radio | Storage and digital transmission between computers |
| Measured throughput or error robustness compared with each other | Not stated by ITU; no head-to-head benchmark is cited in this article | Not stated here; no head-to-head benchmark is cited in this article |
Can Morse code be used for text input?
Experimentally, yes. A 2020 pilot paper by Gueorguieva, Rakhmetulla, and Arif, titled “Enabling Input on Tiny/Headless Systems Using Morse Code,” describes a custom mobile keyboard for Morse-based text entry and reports a small user study. The study’s two participants had no prior Morse experience. Their average entry speed was 5.0, 5.9, and 6.7 words per minute across three sessions, and the authors report an average error rate of 1.7% over the study.
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- Sample size. Two participants is far too small to generalize. The authors state that the sample was very small.
- Visibility of input. The participants could see what they had entered, which is a condition that differs from some real-world use.
- Error correction. The authors did not evaluate error correction, so the 1.7% figure does not show how errors were recovered.
- Scope. The authors say further study is needed. The paper is an example of exploration, not evidence that Morse is a generally effective or superior input method, including for accessibility.
For a developer, the practical lesson is architectural. A Morse input system needs a timing layer, a unit-length estimator, and a classifier for marks and gaps before any character logic runs. That is more involved than a keyboard event stream, and it is the reason the pilot is interesting as an engineering exercise.
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