It is frustrating but possible for anyone to do.
Prior to going into aviation I was stationed aboard a Coast Guard Cutter. Everyone not working was told to go ashore and receive a Morse code (Blinker) message. We were told that when we received the message we could secure and go to chow. The radiomen and quartermasters got it first and the laughed as they went aboard the ship. Other guys got it and they too laughed as they went aboard the ship. I was the last one standing and the guy on the blinker was getting tired so they told me to come aboard. I found out at chow what the message said. The message read, ”When you receive this message secure and come aboard for chow".
To me it was a stream of lights. The same was true when I went into the radio shack and the radiomen were transmitting using a “Bug”.
