Morse Code History: A Timeline from 1836 to Today

The history of Morse code is, in many ways, the history of modern communication. From a sketch in a shipboard notebook in 1832 to its retirement from maritime service in 1999 and its surprising second life in amateur radio, Morse code has been used continuously for over 180 years. This Morse code timeline walks through every major milestone, from the invention and the famous 1844 demonstration to the Titanic disaster that made SOS universal, the ITU standardization, and how the code survives today.

For a focused look at the inventors themselves, see who invented Morse code. For the technical side of the system, start with what is Morse code. To send a message yourself, open the free Morse code translator.

The Pre-History: 1820–1835

The story doesn't begin with Morse. It begins with electromagnetism.

• 1820: Danish physicist Hans Christian Ørsted discovers that an electric current deflects a compass needle, proving electricity and magnetism are connected.
• 1825: British electrician William Sturgeon invents the first practical electromagnet, a coil of wire around an iron core that becomes magnetic only when current flows.
• 1831: Joseph Henry in the United States builds a much stronger electromagnet and demonstrates that a current can ring a bell over a mile of wire. Henry, who refused to patent his work, would later say that Morse deserved the credit for commercializing telegraphy. Historians widely agree Henry's science made Morse's business possible.

By the early 1830s, all the pieces for an electric telegraph were sitting on workbenches in Europe and America. The question was who would combine them into a practical system.

The Invention: 1836–1838

• 1832: On a ship returning from Europe, American painter Samuel F. B. Morse sketches a single-wire electromagnetic telegraph in his notebook. Morse has no electrical training and no working prototype.
• 1836–1837: Morse, now a professor at New York University, builds a crude prototype. It is mechanically fragile and impractical.
• September 1837: Alfred Vail, a 30-year-old machinist from Speedwell, New Jersey, sees Morse's demonstration and offers to redesign the hardware at his own expense in exchange for a share of patent rights.
• Winter 1837–1838: At the Speedwell Ironworks, Vail rebuilds the telegraph into a working machine and (most historians believe) designs the letter-frequency-optimized dot-dash code.
• January 6, 1838: Vail demonstrates the system over a two-mile wire at Speedwell. The telegraph era has effectively begun.
• January 24, 1838: Morse demonstrates the telegraph publicly at New York University.

For the full story of the Morse-Vail partnership, the controversy over who actually designed the code, and why the naming stuck with Morse, see our dedicated who invented Morse code biography. This timeline stays focused on the when; that article covers the who and how in depth.

The Famous First Message: 1844

• 1843: After years of lobbying, Morse persuades the U.S. Congress to appropriate $30,000 to build an experimental telegraph line between Washington, D.C., and Baltimore, Maryland.
• May 24, 1844: Morse, sitting in the Supreme Court chamber in the Capitol, sends the first official long-distance message to Vail at the Mount Clare depot in Baltimore. The message, "What hath God wrought," from Numbers 23:23, was suggested by Annie Ellsworth, the young daughter of a friend.

The demonstration was a sensation. Within a year, telegraph companies were forming across the United States. Within twenty years, transatlantic cables would link continents.

Expansion and Standardization: 1845–1865

• 1845: The Magnetic Telegraph Company forms to commercialize Morse's patents. Alfred Vail publishes The American Electro Magnetic Telegraph, the first technical manual for the system.
• 1846–1851: Telegraph lines spread rapidly across the U.S. and Europe. Competing systems, including the needle telegraph of Cooke and Wheatstone in Britain, fight for market share. Morse's dot-dash system wins in America; various needle systems dominate in Europe.
• 1851: The Austro-German Telegraph Union adopts a "Continental" version of the Morse code at a conference in Vienna. This version eliminates the long-vs-short internal spacing of American Morse and standardizes a cleaner set of letter patterns.
• 1858: A first transatlantic telegraph cable is laid, but it fails after only a few weeks of operation. (The first lasting transatlantic cable would not be completed until 1866.)
• 1865: The International Telegraph Union (the predecessor of today's ITU) is founded in Paris and adopts the Continental code as the international standard. This is the birth of what we now call International Morse Code, the version used worldwide to this day. The original American Morse code, with its complex spacing, becomes increasingly obsolete outside the U.S.

The Golden Age: 1865–1912

• 1861: The transcontinental telegraph is completed across North America (October 24, 1861), making the Pony Express obsolete; it shuts down just two days later. (Note: the transcontinental railroad was completed later, in 1869.)
• 1870s–1890s: Telegraph operators become a profession. Skilled operators routinely work at 30 to 40 words per minute. The telegraph sounder, and listening by ear rather than reading paper tape, becomes standard practice.
• 1895: Guglielmo Marconi transmits the first wireless radio signals. Within a few years, radio telegraphy (radio signals carrying Morse) extends the telegraph to ships at sea and to places wires cannot reach.
• 1903: The Berlin Preliminary Conference on Wireless Telegraphy begins the slow process of international radio regulation.
• 1906: The Berlin International Radiotelegraphic Convention adopts International Morse Code as the standard for maritime radio communication. SOS (... --- ...) is officially adopted as the distress signal, though adoption is slow.

The Titanic and SOS: 1912

• April 14–15, 1912: The RMS Titanic strikes an iceberg and sinks. The ship's radio operators, Jack Phillips and Harold Bride, send distress calls in Morse. Phillips's first call uses the older CQD signal; he then switches to SOS as well. The Carpathia receives the call and rescues 705 survivors, but 1,500+ lives are lost.

The disaster had two lasting effects on Morse code history. First, it solidified SOS as the universal distress signal. Ships that had resisted the change quickly adopted it. Second, it led to regulations requiring 24-hour radio watches on ships and standardized radio procedures.

• 1912: The London International Radiotelegraphic Convention mandates SOS as the sole maritime distress call and requires continuous radio watch on passenger ships.

It is worth noting that the Titanic disaster did not invent SOS, as is sometimes claimed. The signal had been official since 1906. What the disaster did was force laggard shipping lines to actually use it, and turn a slow rollout into an instant standard.

Two World Wars and the Apex of Morse: 1914–1960

• 1914–1918: World War I makes field radio telegraphy critical. Trench warfare creates demand for portable Morse transmitters; both sides intercept and decode enemy radio traffic. The codes-and-ciphers intelligence war accelerates.
• 1920s–1930s: Amateur ("ham") radio booms. Hundreds of thousands of enthusiasts worldwide communicate via CW (continuous wave Morse). The ARRL in the U.S. and RSGB in Britain become major cultural institutions.
• 1932: The Madrid International Telegraph Convention formally reaffirms International Morse Code as the global radio standard.
• 1939–1945: World War II is the high-water mark of Morse code. It's used by every military for battlefield communication, submarine coordination, espionage, and resistance networks. The famous "spy radio" sets used by SOE and OSS agents broadcast in Morse. Even captured Allied prisoners use hidden radios to tap out Morse on water pipes.
• 1948: Claude Shannon publishes A Mathematical Theory of Communication, founding information theory. Morse code becomes a textbook example of variable-length source coding, the same principle that, decades later, underlies Huffman coding in ZIP files and JPEGs.

The Slow Retirement: 1960–1999

• 1960s: Teletype machines (RTTY, "radio teletype") and later computer-based digital modes begin replacing Morse for many commercial uses.
• 1970s: Satellite communication starts to take over maritime distress. The Inmarsat system and the Global Maritime Distress and Safety System (GMDSS) are conceived.
• 1980s: Most navies and merchant marine fleets phase out Morse-trained radio operators. Packet radio and early digital modes grow among hams.
• 1988: The SOLAS convention (Safety of Life at Sea) is amended to require GMDSS, satellite-based distress, on all large ships. Morse is no longer required for safety.
• February 1, 1999: Maritime Morse code officially ends. The last Morse distress watch is closed. The final commercial message in Morse from a U.S. Navy ship is reportedly sent with the words: "What hath God wrought. This is the end of landline Morse." The era is over.

Morse Code Today: 1999–2026

The retirement of maritime Morse didn't kill the code. It just relocated it.

• 2000–2007: The FCC gradually eliminates the Morse code requirement for U.S. amateur radio licenses. The code-speed requirement is reduced in 2000, and in December 2006 the FCC votes to drop Morse testing entirely for all license classes, effective February 23, 2007. Despite this, Morse (CW) remains popular among hams who learn it voluntarily.
• 2000s–2010s: Accessibility becomes a major new use. Apple's iOS ships with a Morse code input method for users with motor impairments. Assistive devices using single-switch Morse input let people with ALS, cerebral palsy, and spinal injuries type at 10 to 20 WPM.
• 2010s: Software-defined radio (SDR) and digital modes like FT8 grow explosively. Yet CW remains the second most popular mode in amateur radio contests, behind only single-sideband voice.
• 2020s: The 175th anniversary of the 1844 message passes quietly. Morse persists as an emergency skill (SOS still works with anything that can flash or beep), an aviation tool (NDB beacons still broadcast Morse identifiers), a maker-project staple (Arduino Morse keyers are a perennial favorite), a cultural touchstone (the dot-dash visual language appears in everything from puzzles to brand logos), and even as body art. See our Morse code tattoos guide for the modern ink movement.
• 2026: Morse code remains in active use by an estimated hundreds of thousands of amateur radio operators, in accessibility software, in aviation, in emergency training, and as a hobby. For the full list of modern uses (ham radio, aviation beacons, assistive tech, maker projects, and more), see our is Morse code still used today? guide. Try it yourself with the Morse code generator or browse the complete International Morse Code reference.

The Full Morse Code Timeline (Quick Reference)

• 1820: Ørsted discovers electromagnetism
• 1825: Sturgeon invents the electromagnet
• 1831: Henry rings a bell over a mile of wire
• 1832: Morse sketches the telegraph concept on a ship
• 1837: Morse and Vail partner; Vail redesigns the hardware
• 1838: First working demonstration at Speedwell, NJ
• 1844: "What hath God wrought" sent Washington → Baltimore
• 1851: Continental (International) Morse adopted in Vienna
• 1858: First lasting transatlantic cable
• 1865: International Telegraph Union founded; International Morse standardized
• 1895: Marconi invents wireless radio
• 1906: Berlin Convention adopts SOS for maritime use
• 1912: Titanic disaster; SOS becomes mandatory
• 1932: Madrid Convention reaffirms International Morse
• 1948: Shannon publishes information theory; Morse is a foundational example
• 1999: Maritime Morse officially retired; GMDSS takes over
• 2000–2007: FCC drops Morse from all U.S. ham license requirements
• 2010s: iOS adds Morse input for accessibility
• 2026: Morse lives on in ham radio, accessibility, aviation, and emergency signaling

Frequently Asked Questions

When was Morse code invented?

Morse code was developed between 1837 and 1838 by Samuel Morse and Alfred Vail. The first working demonstration took place at the Speedwell Ironworks in New Jersey on January 6, 1838. The first official long-distance message, "What hath God wrought," was sent on May 24, 1844.

When did Morse code stop being used?

Maritime Morse code officially ended on February 1, 1999, when the Global Maritime Distress and Safety System (GMDSS) took over. However, Morse code never stopped being used entirely. It remains in active use by amateur radio operators, in aviation navigational beacons, in accessibility software, and in emergency training.

Why was SOS chosen as the distress signal?

SOS (... --- ...) was chosen because it is a single unbroken prosign (three dots, three dashes, three dots) that is easy to send, easy to recognize in noise, and unambiguous. It was officially adopted at the 1906 Berlin Convention and became mandatory after the 1912 Titanic disaster. It does not stand for "Save Our Souls" or "Save Our Ship."

When was Morse code standard standardized?

The International Telegraph Union (now the ITU) adopted International Morse Code, also called Continental Morse, at its founding convention in Paris in 1865. This version, with cleaner spacing rules and a few letter changes from the original American Morse, became the global standard and remains so today.

Is Morse code still required for a ham radio license?

No. The United States dropped the Morse requirement in stages: Technician in 2000, General in 2006, and Extra in 2007. Most other countries have done the same. Today Morse is voluntary, but many hams learn it because CW (continuous wave Morse) remains one of the most reliable long-distance communication modes. See our how to learn Morse code guide if you'd like to start.