Star Wars: A Flicker of Hope
A beckon call is a small communication device that links up with the slave circuits on a starship. When activated, the beckon call transmits a signal to the starship it is linked to, activating its autopilot programming and summoning the ship to the nearest safe spot close to the wielder. A beckon call functions only when connected to a starship with a slave circuit.
Source: Jedi Academy Training Manual, p. 60