Wireless Ship Act of 1910

The Wireless Ship Act of 1910, formally titled "An Act to require apparatus and operators for radio-communication on certain ocean steamers" (36 Public Law 262) and also known as the "Radio Ship Act of 1910" and the "Radio Act of 1910", was the first federal legislation regulating radio communication in the United States. It required certain ocean-going vessels exiting U.S. ports to carry radio equipment, and although it did not require stations or operators to be licensed, it did require certification that operators and radio equipment met minimum standards.

Source: Wikipedia — Wireless Ship Act of 1910 (CC BY-SA 4.0)