The bottom screen of your 3DS is your mapping interface. As you explore, your party automatically draws the basic layout of the corridors and rooms. However, it's up to you to manually mark important features like treasure chests, doors, stairs, F.O.E. patrol routes, and even hidden passages. Use the stylus to draw walls, place icons, and add notes. A well-maintained map is invaluable for efficient exploration, avoiding dangerous F.O.E.s, and remembering where you've been. Don't underestimate the importance of marking F.O.E. patterns; understanding their movement is often the key to bypassing them or setting up ambushes. Regularly check your map and update it as you uncover new areas or encounter new obstacles.
While the sequel Persona Q2: New Cinema Labyrinth introduces streamlined auto-mapping features, the original title requires players to manually place icons for shortcuts and hazards to survive.