Even if these companies never sold another PLB, they'd be just fine. They make most of their money selling ELTs for aviation and EPIRBs for marine vessels. (It'

Even if these companies never sold another PLB, they'd be just fine. They make most of their money selling ELTs for aviation and EPIRBs for marine vessels. (It's all the same tech, just different form factors.) Also, the people who paid the premium for a PLB over a Spot/InReach are likely to pay the premium for a PLB over an iPhone too. The fact that thes are dedicated, purpose-built devices that are guarenteed to always work, anywhere, in even the worst conditions is the entire selling point - and that hasn't changed.