With regard to the statement below, about shutting down GPS during a national emergency: The U.S. can Via: Capital Gazette:Officials reinstated brief lessons in celestial navigation this year, nearly two decades after the full class was determined outdated and cut from the curriculum.That decision, in the late 1990s, made national news and caused a stir among the old guard of navigators.Maritime nostalgia, however, isn’t behind the return.Rather, it’s the escalating threat of cyber attacks that has led the Navy to dust off its tools to measure the angles of stars.After all, you can’t hack a sextant.