See Captain, a symbol of manliness, like Abbot, Athlete, and King.
A person of authority. Authority over Water. Water relates to the emotions, compulsive tendencies, or, less often, being particularly sensitive.
A leader and example, but the Admiral also represents masculinity that has rejected aggressiveness.
The dreamer is very self-confident, able to steer the ship of life (although sometimes aggressively). There is a sexual connotation here, since a ship is generally thought of as female. One wants to rule and own women. After all, the Admiral is a seafarer, and a symbol of unrestricted sexuality.
Folklore: A very important event is about to take place.... Little Giant Encyclopedia
Because he represents an authority figure in your waking life, dreams of captains may represent an aspect of your personality that is steering you (the ship or airplane) in the right direction. It is important to decide if your dream captain or admiral was decisive and in command, or weak and indecisive. A symbol of the Jungian archetypal hero, the soldier is a symbol of the desire to succeed in life. Freudians may see this symbol as an expression of sexual desire. Sailors, by contrast, express the more adventurous aspects of your personality.
They live and work at sea, a Jungian symbol of the unconscious, so the dream may suggest a desire to explore your inner self.... The Element Encyclopedia