The RDF Navigation System, (RDFナビゲーションシステム Arudiefu Nabigēsyon Shistemu) also known as Navi (ナビ Nabi) is a character from Natsuki Chronicles.

This AI system supports Natsuki Sugiura during her missions with the Rapid Deployment Force giving her the mission briefing, passing calls from Commander Maroon and informing about the situation during the mission.

Navi is installed in all the Dominators used by the RDF.

Curiosities

• Navi's off-voice can be heard on the title screen of the Arcade Mode saying the game's name. She also says the names of each Weapon, Sub-Weapon and Special Weapon in this mode.
• Unlike in Chronicles Mode, Navi is listed in the credits as "system voice".
• Natsumi Yamada voiced Navi.