Even if you don't encounter an enemy attack that disables GPS (which is not difficult), you (meaning anyone concerned with national security) should still be pr

Even if you don't encounter an enemy attack that disables GPS (which is not difficult), you (meaning anyone concerned with national security) should still be prepared for navigation by alternate methods when you consider how often equipment malfunctions can cause self-jamming of GPS. It's happened to me on systems that I support.