Hello all, I found this of interest. It is a podcast where they discuss astronomy. In this episode they discuss how GPS satellites work. http://traffic.libsyn.com/astronomycast/AstroCast-110124.mp3 The main web site is http://www.astronomycast.com Chris Sendero Group Distributors and developers of Sendero GPS for 6 platforms, BrailleNote, BrailleSense, Pac Mate, Windows PC, iPhone and Mobile Geo for Windows phones. Also, distributing Trekker Breeze, Victor Stream, KNFB Reader Mobile, Talks, Mobile Speak, Miniguide and ID Mate. To change your email settings (unsubscribe, digest only, or vacation mode): http://senderogroup.com/social_media/email.htm Additionally, to unsubscribe send an email to gps-talkusers-request@xxxxxxxxxxxxx with "unsubscribe" in the Subject.