Règle correspondante
Germany
Practice Relating to Rule 88. Non-Discrimination
Section C. Wounded and sick
Germany’s Military Manual (1992) states that in conflicts at sea, “hospital ships shall afford assistance to all wounded, sick and shipwrecked without distinction of nationality”. 
Germany, Humanitarian Law in Armed Conflicts – Manual, DSK VV207320067, edited by The Federal Ministry of Defence of the Federal Republic of Germany, VR II 3, August 1992, English translation of ZDv 15/2, Humanitäres Völkerrecht in bewaffneten Konflikten – Handbuch, August 1992, § 1057.
Germany’s Soldiers’ Manual (2006) states:
The wounded, sick and shipwrecked shall be respected and protected in all circumstances … They shall be treated humanely and cared for …
There shall be no distinction among them other than on medical grounds. 
Germany, Druckschrift Einsatz Nr. 03, Humanitäres Völkerrecht in bewaffneten Konflikten – Grundsätze, Erarbeitet nach ZDv 15/2, Humanitäres Völkerrecht in bewaffneten Konflikten – Handbuch, DSK SF009320187, Bundesministerium der Verteidigung, R II 3, August 2006, p. 5.