Allie and the Navigators

Roswell Army Air Force base, 3 a.m., June 15, 1947. A shape appears from the shadows and taps Major Delbert D. Johnson on the forehead. The alien points a glowing raspberry rod at an adjacent table. "That one said you are a navigator."
Indomitable Allie, Intelligent Dreadnought 1, and the gang race home to Prime after surviving a deadly encounter with the Lost Fleet and its dangerous leader, Marine transport vessel Naomi Clevenger.
Everyone knows there are no aliens in the Milky Way. But when a pair of flying saucers land on battle cruiser Miku assumptions are turned upside down. Somewhere, somehow, Navigators are crossing galaxies at speeds that would make FTL pilots blush.
Soon, Allie, Rin, and the Marines are fighting for their lives against Gleep, the evil commander of the Navigation Guild on distant planet Kazor, and a rapacious fleet of bug ships crewed by arachnids.