A short history of Morse code

Origins (1830s–1844)

In the 1830s Samuel F. B. Morse, an American painter, began collaborating with the inventor Alfred Vail and physicist Leonard Gale on a practical electric telegraph. Vail in particular contributed the early code itself — what would later be called American Morse. The first formally demonstrated message was sent on May 24, 1844, between Washington, D.C. and Baltimore: “What hath God wrought.”

From American Morse to International Morse (1860s–1912)

American Morse used some odd character lengths (extra-long dashes, internal spaces) that worked on physical wires but suffered on radio. Friedrich Clemens Gerke published a simplified version in 1848, which the European telegraph conferences adopted, refined, and standardized as International Morse Code by the early 20th century. Today the ITU maintains the international standard as ITU-R M.1677-1.

Wireless and the SOS distress signal (1903–1912)

Marconi’s wireless telegraphy turned Morse into a maritime backbone. After several incompatible distress calls (CQD, NC, SOE), the 1906 Berlin International Radiotelegraphic Conference chose SOS — three dots, three dashes, three dots — purely because the rhythm was unmistakable. It became internationally effective on July 1, 1908, and famously rang out from RMS Titanic in 1912.

The world wars and aviation (1914–1945)

Both world wars relied on Morse for low-power, low-bandwidth, often-jammed conditions where voice would have failed. After 1945, aviation held onto Morse for navaid identification — VOR and NDB beacons still transmit their identifiers in Morse today, decoded by pilots reading the chart.

The end of maritime Morse (1999)

On February 1, 1999, the Global Maritime Distress and Safety System (GMDSS) replaced Morse for ocean distress, retiring nearly a century of dot-dash maritime tradition. The very last commercial U.S. Morse transmission ended on July 12, 1999.

Why Morse is still alive in amateur radio

In ham radio, Morse — known as CW (continuous wave) — survives because it works. CW signals get through under conditions where SSB voice can’t copy a syllable. A modest QRP transmitter can cross oceans with CW. There’s also a tactile pleasure to it that keeps generations coming back to the key.

Learn it the modern way

• Use the Koch-method trainer at full target speed.
• Memorize sound shapes, not dots and dashes.
• Practice prosigns from our reference.
• Pick up CW abbreviations and Q-codes early.
• Generate any message in our translator and listen to the audio.

Sources / further reading: ITU-R M.1677-1 (2009); ARRL CW operating guides; Berlin International Radiotelegraphic Conference Final Acts (1906); IMO GMDSS implementation timeline.