Freefall in color by many folks.
Niomi (thinking): Navigation seems simple enough. The front of the station is forward. The rear is aft. Left is port, right is starboard. It's like being on a ship. A really big ship with thirty floors.
Niomi (thinking): There's a grid system as well. Port, forward is A,1. Go starboard and aft, it goes up. My apartment is on floor 20, grid C4.
Niomi (thinking): Good. Now that I know the system, if I get lost, I'll know exactly where I am.