DoorCity uses motion sensors to track movement where GPS is unavailable.
Instead of relying on pre-built indoor maps, it uses building structure — such as corridors, doors, and vertical transitions — to continuously correct position.
This approach, called SCHIN (Structure-Constrained Hybrid Inertial Navigation), reduces drift and improves accuracy over time.
Each user interaction improves the system, making navigation more precise for the next user.
Instead of relying on pre-built indoor maps, it uses building structure — such as corridors, doors, and vertical transitions — to continuously correct position.
This approach, called SCHIN (Structure-Constrained Hybrid Inertial Navigation), reduces drift and improves accuracy over time.
Each user interaction improves the system, making navigation more precise for the next user.