Travelers often lose GPS signal in mountains, deserts or rural areas. Current navigation apps fail when offline or show outdated maps.
Build an app that downloads regional maps for offline use and crowdsources road closures, hazards and detours from other users. Highlight user-verified routes and warnings.
Monetize through premium features like saved routes or business listings for mechanics/hotels along remote routes. The first version could just offer offline maps with basic reporting features.
The biggest risk is competing with free Google Maps offline mode, but focusing on community-powered updates in specific regions could carve a niche.