While I believe only the U.S. Navy currently uses Morse Code, during World War II its use was ubiquitous. During my intermittent attempts to learn code, I butt against my inability to differentiate one letter/numeral from another. How are individual letter/numerals differentiated, particularly during high-speed transmission (via bug??) to read and write words and numbers (above single digits)? For me, everything just runs together, kind've like reading German.