ＧＰＳ衛星更新遅れ？

ＧＰＳ、精度低下の恐れ　来年以降、米の衛星更新遅れ
http://www.asahi.com/science/update/0824/TKY200908240172.html

Air Force responds to GPS outage concerns
http://www.networkworld.com/news/2009/052109-air-force-responds-to-gps.html?page=1

米空軍宇宙司令部、「GPS危機」報道にTwitterで回答
http://japanese.engadget.com/2009/05/21/gps-twitter/