Penn Station, in the heart of New York City, is the busiest transit hub in the Western Hemisphere. It is also one of the most notoriously chaotic infrastructure spaces in the United States. Penn is dysfunctional, largely–but not exclusively—because of overcrowding and congested circulation. Confusion (spatial disorientation) is another key challenge in Penn, amplifying congestion. Reducing confusion could be done quickly and economically with a mobile wayfinding system.