Blind users lose AI navigation assistance the moment they enter a subway or elevator with no signal

Cloud-based visual assistance apps like Be My Eyes and Seeing AI require constant connectivity to describe surroundings to visually impaired users, but the places where blind users most desperately need real-time scene description — underground subway stations, elevators, parking garages, building stairwells — are exactly the places with zero cell signal. A blind person navigating a New York subway transfer between the A and C trains at 59th Street has no connectivity for the 4-7 minutes they are underground, precisely when they need an AI to read platform signs, identify which train is arriving, and describe obstacles. Cloud AI fails at the exact moment the user's safety depends on it. On-device Gemma 4 with multimodal vision capability can continuously process the phone's camera feed and provide audio descriptions entirely offline — no connectivity gaps, no latency spikes, no service interruptions. The model must be on-device because the environments where blind users face the highest navigation risk are structurally the same environments where internet is unavailable.