Jun 10 1922

From The Space Library

Guglielmo Marconi of Italy stated that an apparatus could be designed to transmit radio waves from one ship in any desired direction and pick up reflections from another ship in a receiver, a device which would "thereby Immediately reveal the presence and bearing of the other ship in fog or thick weather." Christian Huelsmeyer of Germany received a patent in 1904 on boat equipment which used reflected radio waves for navigational use on the Rhine River.