On August 11, 1909, off the coast of Cape Hatteras, telegraph operator Theodore Haubner called for help from the steamship, S. S. Arapahoe. He was momentarily confused because a new telegraph code “SOS” had recently been ratified by the Berlin Radiotelegraphic Conference to replace the old “CQD”, and he wondered which signal he should send. He sent both.
Haubner’s transmission was the first recorded American use of “SOS” to call for help.