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The nav-unit was a green object that Ratchet clipped onto the belt of the Pilot Suit. It presumably was his source of navigation when on foot. He only mentioned any use thereof in Tools of Destruction although it appeared in future games.
- Ratchet & Clank Future: Tools of Destruction (first appearance)
- Ratchet & Clank Future: Quest for Booty
- Ratchet & Clank Future: A Crack in Time
- Ratchet & Clank: All 4 One
- Ratchet & Clank: Into the Nexus