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> Purportedly newer GPS satellites don't have the option anymore. That does sound suspiciously like something the military would want you to believe
by rangibaby 8y ago
> Purportedly newer GPS satellites don't have the option anymore.
That does sound suspiciously like something the military would want you to believe
- vlovich123 8y agoSelective availability was defeated a very long time ago so no reasons to doubt that the military gave up on it. Pretty sure they're just using an encrypted transport for the military signal so they can do whatever they want to civilian GPS wholesale without impacting the military. However, I'm not sure how that will work since it underpins our entire economy from logistics to air travel. On the other hand, at the point the military is disabling civilian GPS probably the economic impact is less of a concern.
- labcomputer 8y agoIt's worth mentioning here that SA-less Block IIF (and newer) satellites came after "codeless" and "semi-codeless" techniques were publicly-known. Those allow a receiver to use the encrypted P(Y) code to obtain a precise position fix without any knowledge of the encryption key. There are probably other, newer ways to prevent an adversary to use the GPS signal, but there is little reason to doubt that SA is gone.