Ah-ha!
If you go to the main library page at library.brenau.edu and input the search terms Global Position System into the Search Everything tab you will find a wealth of information.
I would suggest narrowing your search, using the limiters on the left side of the screen to help narrow your search for materials.
For books you should select: Brenau Trustee Library, full text, and ebook.
For articles you should select Brenau Trustee Library and peer reviewed.
Good luck with your research.