Why GPS denial is the design constraint, not an edge case
Satellite navigation is the first thing a peer adversary takes away, and it goes early. Treating GNSS denial as a degraded mode you fall back into gets you a system that works on the range and fails in the fight. Designing for its absence from the first sketch changes more than the software - it changes sensor placement, the shape of the nose, the power budget, and how much compute you carry. This is what visual navigation actually costs at the airframe level, and why we pay it on every system in the line rather than the expensive ones.
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