Main problem is that after a nuclear exchange there is a good chance there may only be a few surviving satellites in orbit. Many nukes would be used to destroy military satellites, civilian communication satellites, and anything that could be repurposed. Even things that weren't a target would suffer radiation damage from nearby explosions. Its why the Project had plans to launch new satellites after they woke up. To replace the stuff they lost. Still a good idea though to have local maps and know how to read them.
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