Just to add what I've found. Any help here

This Site has pics of prime internals some of which you can see gps chip. I think is is the BCM 47511 As seen in the below screenshot


This Site says broadcom "gps" for prime


Here's a Site for the specs for the 47511

investor.broadcom.com/common/mobile/iphone/releasedetail.cfm?releaseid=548713&CompanyID=BRCM& mobileid=