astronavigator
A specialist who navigates a spacecraft, analogous to a navigator on a ship. Often used in science fiction contexts.
See also: 航海士
He trained as an astronavigator for the spaceship.
Compound of 航 (navigation), 宙 (space), and 士 (specialist). Modeled after 航海士 (navigator) with 宙 replacing 海 (sea).