Hi Morten,
Angolia & Schlicht's Die Kriegsmarine - Uniforms & Traditions - Page 88 and 93 gives this information about the positioning of insignia for Matrosen. Included in the pics for career abzeichen is the Flugmeldedienst patch.
Here is a photo from my collection showing the same career badge on the lower sleeve. It is not gold on blue like the Funker badge above it. It may be the rare red on blue badge. See here for an example. http://www.wehrmacht-awards.com/forums/showthread.php?t=574572&page=7
Cheers,
Larry