I have spoken with several ham radio operators who use Morse code, and none of them use or learned Gregg shorthand, nor do they know of any Morse operator who does use shorthand.
This seems odd to me, as it makes sense that in taking down code, a faster method of writing would be most helpful.
The time of Morse and Marconi matches up with Dr. Gregg's work.
Anyone know why the Morse operators don't standardly use Gregg? Or if Dr. Gregg ever met with Mr. Morse?