Hi Debbie, there are 2 good PDF files on the internet, you should google for "gpssps1.pdf" and "gpsspsa.pdf", these are rather detailed, explaining about the signal, the sats, the data format and some useful calculations for GDOP and viewing probability Greets Jochen Feldhaar DH6FAZ PS: If they are no more present, I could mail them privately (ca 2.5 MB).... Debbie Hynes wrote: > CZers, > > Does anyone know of any on-line tutes about GPS? Or maybe a book title? Something with a "how to" slant esp wrt microcontrollers and esp the PIC! Heh I know what the initials stand for but that's about all :( > > Thankz - Debbie > > > > --------------------------------- > Yahoo! Hint Dropper > - Avoid getting hideous gifts this Christmas with Yahoo! Hint Dropper! > > -- > http://www.piclist.com hint: PICList Posts must start with ONE topic: > [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads > > > > > -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics