My old Garmin ETREX is showing its age. I bought it in 2006 for a trip to Iraq based on the advice of a Marine Capt who had just got back from his trip to the sandbox. It was the cheapest available at the time. But it did it's job well. I've noticed in Northern VA when GeoCaching it doesn't do well with tall trees overhead or even near by. I am trying to decide if I should get a new GPS, or is there an app for the iPhone work as well. I do travel for my job, and cannot rely on cell towers/wifi to help with the fix like Waze does. Mainly the GPS will be needed for GeoCaching. And if the Naval base I visit every year every reboots the adventurers club I can do some more amateur battlefield archeology. And MGRS support is a nice add on.