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Gerke changed many of the codepoints, in the process doing away with the different length dashes and different inter-element spaces of [[American Morse code|American Morse]], leaving only two coding elements, the dot and the dash. Codes for [[German language|German]] [[Umlaut (linguistics)|umlaut]]ed vowels and '''{{sc|CH}}''' were introduced. Gerke's code was adopted in Germany and Austria in 1851.<ref name=Deutsch-Österreich-Telegr-1851/>
This finally led to the International Morse code in 1865. The International Morse code adopted most of Gerke's codepoints. The codes for '''{{sc|O}}''' and '''{{sc|P}}''' were taken from a code system developed by Steinheil. A new codepoint was added for '''{{sc|J}}''' since Gerke did not distinguish between '''{{sc|I}}''' and '''{{sc|J}}'''. Changes were also made to '''{{sc|X}}''', '''{{sc|Y}}''', and '''{{sc|Z}}'''. The codes for the digits '''{{small|0}}'''–'''{{small|9}}''' in International Morse were completely revised from both Morse's original and Gerke's revised systems. This left only four codepoints identical to the original Morse code, namely '''{{sc|E}}''', '''{{sc|H}}''', '''{{sc|K}}''' and '''{{sc|N}}''', and the latter two had their ''dahs'' extended to full length. The original American code being compared dates to 1838; the later American code shown in the table was developed in 1844.<ref name=Smithsonian-Report-1879/>
===Radiotelegraphy and aviation===
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