I am currently revising the whole war diary of the Bismarck, correcting typos, improving the translation, etc, and perhaps someone can help me with this. Any idea what kind of signal was "Otto Ulli" ?? I believe it has something to do with air operations but can't say for sure.
Here are a couple of excerpts from Bismarck's War Diary.
1830 Uhr - 1909 Uhr / 1830-1909 hours-
Gibraltar wiederholte vormittage 3 Otto Ullis für Hans.
Gibraltar repeated this forenoon 3 Otto Ullis [signals] to Hans [Force H].
2121 Uhr / 2121 hours-
Q J 2 gab mehrere Otto Ullis Op.Funksprüche, zuletzt 1856 Uhr, Peilung Brest 276 Grad."
QJ2 [Ark Royal] transmitted several Otto Ullis operational radio messages, the last at 1856 hours, bearing from Brest 276º.”