A permit is not a deployment, and certification is not free. Wing Aviation's May 23, 2023 grant US11656638B1 claims a backup navigation system for unmanned aerial vehicles — a fallback for when GPS or the primary navigation source drops out.
Read the regulatory driver in the claim. The CPC tags — G05D 1/106 altitude control, G01C 11/06 photogrammetric navigation, G01C 21/32 map-based positioning, G06V 20/13 aerial imagery, plus a block of B64C 2201 UAV-operations classes. Backup navigation exists because regulators demand fault tolerance for beyond-visual-line-of-sight operations.
The contracts-and-capex read is that redundancy is a cost of doing business in drone delivery, not an optional feature. The FAA does not certify a single-point-of-failure aircraft for autonomous operation over populated areas. Every redundant subsystem is engineering and bill-of-materials cost in service of a permit.
For a money-desk reader, the discipline is to treat regulatory-driven redundancy as a structural cost on drone-delivery unit economics. Wing, as Alphabet's drone effort, can fund it; a thinly capitalized competitor may not be able to afford the certification path this patent represents.
The honest limit: a backup-navigation patent does not disclose Wing's certification status, cost, or delivery volumes. It establishes that regulatory-grade redundancy is being engineered, which is the relevant cost signal.
The takeaway for the money desk: in drone delivery, redundancy is the regulatory tax. Read fault-tolerance patents as evidence of the certification spend that separates fundable operators from the rest.