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Screensize: 640 x 480 800 x 600 1024 x 768 1280 x 1024 UserName: Password: Format Mode: Basic  Help  Prompt  Format: Font Andale Mono Arial Arial Black Book Antiqua Century Gothic Comic Sans MS Courier New Georgia Impact Lucida Console Script MT Bold Stencil Tahoma Times New Roman Trebuchet MS Verdana   Size 1 2 3 4 5 6   Color Black Red Yellow Pink Green Orange Purple Blue Beige Brown Teal Navy Maroon LimeGreen Message: * HTML is OFF * Forum Code is ON Smilies [quote][i]Originally posted by shorty[/i] [br]There is a free software available from the Trimble website, with which you can "forecast" the theoretical number of satellites in view for a specific position (as well as other parameters, like DOP, etc.) http://www.trimble.com/planningsoftware.html Be sure to always use the most actual ephemeris data (available from link "Support" -> "Download" -> "Ephermis File" or at http://www.trimble.com/planningsoftware_ts.asp?Nav=Collection-8425 The concept of GPS was nominally only for 24 satellites, so I think some of the 28 satellites are just for backup, but I'm not sure if the backup satelllites are also in service (marked "healthy") for positioning. By the way: the constellation of the GPS satellites should be theoretically the same every 23 hours and 56 minutes (but of course changes slighty in practice). The reason for the 4 minute difference to 24h is the celestial time reference used for the GPS satellites orbits. [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.