However, in German tradition and in line with seamen's language, the title is abbreviated to "Herr/Frau Kaleu" in verbal communication (contemporary usage).

The United States Navy's rank of lieutenant is equal to Kapitänleutnant in NATO's military hierarchy (classed as OF-2).

However, German Navy Kapitänleutnant might be assigned to the so-called "line officer career" (de: Truppendienstlaufbahn or Truppendienstoffizier) or "officer specialist career" (de: Fachdienstlaufbahn or Fachdienstoffizier, officially: Offizier des militärfachlichen Dienstes).

A Kapitänleutnant (line officer) may command smaller ships (e.g. submarine class 206A, minehunter class 332) or serve as principal warfare officer on larger warships, giving the rank responsibilities more along those of a Lieutenant commander in the U.S. or Royal navies.

Military people of the "line officer career" skip over the rank Stabskapitänleutnant, by regular promotion from Kapitänleutnant (OF-2) to Korvettenkapitän (OF-3).