Jack, our apologies if your question was not answered in a timely manner, but as I am sure you are aware, the forum is staffed by volunteers all of whom have jobs, families and other things going on it their lives. Anyway, what exactly are you looking for in a 'GPS' app? The native Apple Maps app, or the free Google Maps app, are both more than capable of pinpointing your location if that's all you are looking for? You have a fairly old iPhone there assuming you have a 4S, but the turn-by-turn navigation that both Apple Maps and Google Maps apps offer is also available for an iPhone of that vintage.