Her Imperial Majesty's/Imperial Navy Ship Captain

I'm in the process of updating the terminology relating to the Imperial Star Navy. However, I'm not sure whether to use a translation for "Her Imperial Majesty's ship Captain" or "Imperial Star Navy ship Captain". Would you recommend my use of the former or latter translation? Which, if any, of the following translations for "Her Imperial Majesty's ship Captain" would be best: Kenturió Nautikae Augustae, Kenturió Nautika Augustae, Kenturió Nauis Augustae, or Kenturió Náuis Augustae? Which, if any, of the following translations for "Imperial Star Navy ship Captain": Kenturió Nautikae Klassáriae Setlláris Imperiális, Kenturió Nautika Klassáriae Stelláris Imperiális, Kenturió Nauis Klassárise Stelláris Imperiális, or Kenturió Náuis Klassáriae Stelláris Imperiális? If any guess is in the wrong case—but otherwise correct, what's the correct translation?
 
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