I was looking for a free GPS app that I could use when I check out hikes for a dog group Im in. There are many apps that can do this, of course. However, when I actually tested them, I discovered that most would eat up your battery in short order. Some would not work unless the app were on and in the foreground all of the time.
Also, some would not let you export the track you created.
Some would not let you use the app unless you signed up using Facebook or an email.
JAS tracker has none of these negatives. Its fairly easy to use as well. (Unlike Viewranger...which is great but way too complicated.)
You can export right to Google Earth or as a GPX file. I hiked for an hour and a half and it only used 8% of my IPhone 5s battery.
Its got nice free maps with it that I believe you can use offline as well.
I dont know why this app isnt more popular.
Mike11939 about JAS Location Tracker