The fixer grid is an alternative grid a fixer can enter by hacking the normal grid entrance. This alternative grid has exit points all over Rubi-Ka, and make traveling around a lot easier.
How does it work?Edit
By casting the Hack Grid Data Stream the fixer (and if casting Hack Grid Data Stream (Team) also team members) will get a Data Receptacle in inventory. Using this on a grid entrance will bring your character into the Fixer Grid.