The quartermaster would be responsible for maintaining and distributing food and supplies. They're also the person who resolves onboard disagreements and arguments, unless it's serious enough to go to the Pilot/Captain. So a character who was a quartermaster would probably be charismatic and organized.

The navigator is someone with a detailed knowledge of hyperspace travel and the layout of the immediate universe. A navigator would have had to of gone to college for years and would be highly knowledgable and intelligent.