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Christian Vogel vogelchr at vogel.cxHi Dieter, > Interesting device, I wasn't aware of it (I know about the book). > Is the Source Code of the book available ? So far I have only > seen some material for download at the following site, not sure > if there is the whole content of the DVD: > > http://kom.aau.dk/project/softgps/ The (blue) receiver is the old dongle sold by SparkFun during the last years. I only remember from visiting their website, but don't own one. I don't know if the DVD contains more than the matlab code that can be downloaded. >> There's actually quite a lot of information out there, >> but there also seem to be quite a lot of half-abandoned >> projects (and a few seem to have vanished since the last time I had >> an interest in it around 2005). This site (from 2003)... http://home.earthlink.net/~cwkelley/ ...explains the calculation in the "Operations" section, it's a rather concise summary of the basic math involved. > I had a short look at some but always had the impression that > it is not exactly what I am looking for. I guess I should try > to get a GPS receiver which provides the required data, thats > probably the easiest approach. http://home.tiscali.nl/samsvl/oemtable.htm has a table comparing various chipsets, some are quite ancient. Chris