Because Amidala was necessary for their plans—the queen needed to sign a treaty that would legitimize the illegal occupation of Naboo—Sidious dispatched Maul to find the queen and the Jedi. Maul traced a distress call from Sio Bibble, the governor of Naboo, which Queen Amidala received on Tatooine. With his master's blessing, Maul traveled to Tatooine to locate the queen. http://starwars.wikia.com/wiki/Darth_Maul
Ok, de acordo com a Wookieepedia , parece que ele conseguiu rastrear a ligação de Bibble para Amidala e ela não precisou responder à ligação, como sugere Qui-Gon. (Eu ainda vou parecer mais difícil e ver se eu encontrar qualquer outra coisa).