[wayne_skylar]

Is there no agreed upon way to write those letters with an English keyboard? I know for example in German

ä -> ae

ö -> oe

ü -> ue

At least that is what I was taught. When writing Spanish some of my friends have replaced ñ with gn as in Italian or ny as in Catalan.

[hsivonen]

In Sweden and Finland people typically prefer to omit the diaeresis without adding a trailing e. Due to Germany getting their way, though, the American-readable part on passports uses the German-style conversion to ASCII.