In Season 4 (or 4.5) of Battlestar Galactica, Ellen Tigh and Boomer escape from the Cylon Baseship in a stolen Raptor and head towards the fleet...
From the end of No Exit:
As they make their way down a corridor, Ellen asks Valerii if she has thought through taking part in John's plans. Valerii responds that she has — and surprises Ellen by bringing her to a waiting Raptor. Valerii then races the Raptor out of the baseship, which launches pursuing Raiders. Dodging their gunfire, the Raptor jumps away.
From the beginning of Deadlock:
In CIC, Louis Hoshi detects the Raptor that Sharon "Boomer" Valerii and Ellen Tigh are on, reporting that it (Raptor 702) was logged as missing over a year ago.
So between the two episodes they made their way to the colonial fleet.
My question is: How did Boomer and Ellen know where to find the fleet?