On 5 Mar 2006 14:20:24 -0800, "purple_stars"
wrote:

waynes i'm guessing that you mean that the navy doesn't teach RDF, not
that they don't teach celestial. only reason i say that is because it
seems like the military would need backups like celestial because i
understood that the EMP from a nuclear weapons blast could take out
electronics such as GPS systems. is that wrong ?

Yes, it's wrong. They no longer teach celestial. The military buys
EMP hardened electronics, and has for a long time.