[rdtsc]

> The Navy SEALs (and everyone else) use consumer GPS devices because they cannot risk losing a classified M-code capable GPS device

And presumably because they can eschew many rules that others are bound by. If they wanted iPhones, they could probably get iPhones. They also often have black budgets and it is a real nice if you can sell to them. They release the money quickly, less red tape. Those deals are hard to come by though.