Jango: "He must have put a homing device on our hull. Hang on, son. We'll move into the asteroid field, and we'll have a couple of surprises for him."
―Jango and Boba Fett noticing a Jedi starfighter approaching[src]
After a duel with Jango Fett on Kamino, Obi-Wan Kenobi threw a homing device on the departing Slave I's hull. He tracked the ship to the planet Geonosis. After Boba Fett saw they were being tracked, Jango flew the Slave I into the ring around the planet.
Obi-Wan Kenobi followed in close pursuit of Jango, dodging asteroids and incoming seismic charges. Jango flew through holes in asteroids, but Kenobi would not give up. Jango fired blasters until Kenobi's interceptor got hit. Jango fired a missile at it to finish it off. The missile followed Kenobi no matter where he went.
"R4, prepare to jettison the spare part canisters. Fire them now!"
Finally, Kenobi told the astromech droidR4-P17 to release the interceptor's spare parts. The missile could not dodge the number of tiny objects and made an explosion, which lead Jango to believe he had destroyed his enemy. Kenobi landed on an asteroid and stayed quiet until Jango had entered Geonosis's atmosphere. He then followed the Slave I, ultimately leading to the Mission on Geonosis.
Edit
