I did not hear any mention of the GPS system helping? It seems like it was more all the helicopters overhead and the FLIR. http://www.wusatv9.com/news/news_article.asp?storyid=20496 But then the Baltimore sites don't mention it. http://www.thewbalchannel.com/news/2335293/detail.html?z=dp&dpswid=2266479&dppid=-1 Jim<