Near as I can figure out, there was no standard call for commercial shipping at the time.
CQD was a military code term for Close Quarters Distress. That is what they used ...
Most people think that SOS stands for Save Our Ship, but that is not true - in Morse Code, it was three dots - three dashes - then three dots.
This was the fastest method of signalling distress in Morse Code and they settled on it ...
CQD was a military code term for Close Quarters Distress. That is what they used...
By the way, the call sign for the Marconi Wireless on RMS Titanic was:
By the way, that's the IATA code for Dayton-Wright Brothers Airport in Montgomery County, Ohio.