<P> Radiotelegraphy using Morse code was vital during World War II , especially in carrying messages between the warships and the naval bases of the belligerents . Long - range ship - to - ship communication was by radio telegraphy , using encrypted messages because the voice radio systems on ships then were quite limited in both their range and their security . Radiotelegraphy was also extensively used by warplanes , especially by long - range patrol planes that were sent out by those navies to scout for enemy warships , cargo ships , and troop ships . </P>
who used morse code in world war 2
warships naval bases warplanes , especially by long - range patrol planes that were sent out by those navies to scout for enemy warships , cargo ships , and troop ships