From Bulbapedia, the community-driven Pokémon encyclopedia.
A Navigator is a type of Pokémon Trainer that first debuted in Pokémon XD: Gale of Darkness. They specialize in Template:Type2 Pokémon.
An unnamed Navigator is seen during the opening titles of the game as the first mate of an unnamed Captain of the S.S. Libra. After both of them fell out of the ship in the water by XD001's attack, they're not seen again and are assumed to be dead.