I'm adding a "spoiler" designation to your thread, Missile Mike--welcome to the forum, but please put spoiler in the future in the title of such threads that giveaway info.
I'm having trouble answering you, because you only get taken aboard the Leviathan after you've gotten *four* star maps, not three. You don't have to get off the Ebon Hawk at that time. You're captured and taken off in cutscenes.