At the end of No Exit (Episode 15 Season 4) of Battlestar Galactica, Ellen and Boomer escape from the Cylon Baseship in a stolen Raptor...
(Plot synopsis taken from BSG Wiki)
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.
And in the next episode (Deadlock) they jump exactly to where the fleet is:
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.
Yet the Colonial Fleet had jumped several times since Ellen and Boomer had been with them, so how did they know where to jump in order to get back to the fleet?