Note that the description says "Azimut, Richtungswinkel". Those seem to be somewhat different concepts today. The respective Wikipedia articles don't even menti

Note that the description says "Azimut, Richtungswinkel". Those seem to be somewhat different concepts today. The respective Wikipedia articles don't even mention each other: https://de.wikipedia.org/wiki/Richtungswinkel https://de.wikipedia.org/wiki/Richtungswinkel https://de.wikipedia.org/wiki/Azimut https://de.wikipedia.org/wiki/Azimut