The Precursors are able to speak to Jak through the Astro-Viewer as they would through an Oracle.
After the termination of dark plants in Southern Haven Forest during the "Kill dark plants in Forest" mission, six platforms appear in the water at the center of the forest. Once Jak collects four of the five artifacts, he is able to defeat five ring challenges (in the "Beat pillar ring challenges" mission) set by statues similar to Oracle totems in order to raise the platforms and approach the Astro-Viewer itself. He is then able to use to Astro-Viewer and see the Dark Maker Ship. When Seem gives Jak the Time Map, Jak is able to link into the Dark Maker Ship and manipulate some of the machines during the "Destroy Dark Ship shield" mission. He first had to fight his way through several troopers and hornets who had intended to take control of the Forest together with the Astro-Viewer.