Navigation and signalling after the network fails

What role do analogue navigation and signalling methods have in a digital force?

Flags, signal lamps, semaphore, and sextants provide lower-bandwidth fallbacks when networks, satellites, or GPS fail.

Resilience requires a workable fallback for predictable digital failures. Signal lamps, semaphore, flags, and sextants carry less information than networked systems, but an enemy cannot hack a flag. The Royal Navy's continued training in these methods can appear conservative until jamming or satellite loss makes them useful again. The tank-command analogy captures the trade: a force may accept less awareness when closing off a vulnerable route is what allows it to survive.