Possible Clues:

• Maintain strict standards, as shown by this graph unit prepared
• Oversee an efficient body
• Around start of tour, train high-ups at sea to maintain discipline
• Enforce discipline, after being too free with the rum ration?
• Go buy the book? Heard it's something you'd expect captain to do if no room on board!
• Enforce efficiency as captain with a drunken crew?
• Be strict in managing an organisation
• Exert discipline in organisation
• Be in control of efficient organisation