ahlam1399
02-22-2016, 03:02 PM
A decade after phasing out celestial navigation from its academy courses, the U.S. Navy has restarted that formal training. The shift comes at a time of growing anxiety over possible threats to GPS.
أكثر... (http://www.npr.org/2016/02/22/467210492/u-s-navy-brings-back-navigation-by-the-stars-for-******rs?utm_medium=RSS&utm_campaign=news)
أكثر... (http://www.npr.org/2016/02/22/467210492/u-s-navy-brings-back-navigation-by-the-stars-for-******rs?utm_medium=RSS&utm_campaign=news)