Brendan, the Epic 4g uses the multifunction Qualcomm QSC6085 for GPS functions. QSC6085 features include support for EV-DO Rev. A with backward compatibility to EV-DO Rel. 0 and CDMA2000. you can read more about on [http://www.techrepublic.com/photos/samsung-galaxy-tab-teardown-sprint/483719?seq=40|here] and [http://forum.xda-developers.com/showthread.php?t=809849|here as well]. The datasheet is available [http://www.datasheet4u.net/download.php?id=696296|at this site.] Good Luck to you and I hope this is the info you were looking for.