I'm not sure what kinda of chip set it has, but it's been working awesome. I had bought me this key chain FOB at CVS to store the Extra Map Micro SD cards in. I have had very fast acquisition time on it and have used it in some hard to get signal areas, what ever chip they used it works really really good.

http://www.cvs.com/CVSApp/cvs/gateway/detail?prodid=407151&previousURI=/CVSApp/cvs/gateway/search?page=2^Query=pill^ActiveCat=65^startLink=1