It's called Animation on demand. I doubt anyone understands how that works.
:har:

The Radione R2 was produced in Wien starting from 1939, while the R3 was introduced a couple of years later as the military version of the R2.

Sources:
https://www.cryptomuseum.com/spy/radione/r3.htm
https://www.roetta.it/ik3hia/pages/O...radione_r2.htm

Both were adopted by the Kriegsmarine, and the usage of both aboard U-boat is well documented. Uboatarchive.net, for one, mentions the R2 among the U-boat radio equipment. The R3 is not mentioned though. For sure the later model was not available during the first one and half year of the conflict, but it is likely that it became more common towards middle-late war. Those are actual points, I am sorry to say that a motion picture proves nothing :03::salute:

BUT, BUT, BUT! It was on the Television! Are you saying that it's not TRUE?
:o
:har:

Well well, I might sound like a blasphemer, but often truth and TV don't go in the same direction, and under many respects Das Boot is not the most accurate historical account in the history of the seventh art. But I better shut up if I don't want to be sent to the Eastern Front under the allegation of defeatism :D