GPSDiary

The app is simply a diary of all the excursions over the time with the main data and tracks in gpx format and an eye to battery life.
There is no maps, for that there are already many other apps, but the generated gpx can be imported into any program that handles gpx files.
The app keeps track of the main data of a hike (name, description, notes, distances, time, date, height, speed) in order to create a diary of trips over time.
With the data collected it is possible, for example, immediately derive the distance traveled in a month, the weekly difference in height, the number of tracks made in a year divided by type (skiing, running, walking, ...) and so on.
Tracks and dots are stored in gpx files, plus data can be saved and exported in text format (.txt) or CSV (to be imported and processed in a common spreadsheet).
On your smartphone you can operate search, edit all data for correct some information and display simple graphics in time.
The app occupy very little memory on the phone.
By enabling notifications from the setup menu you can view the summary of the data in real time as well as pause the application also with smartwatch (Android Wear).
The whole app consumes very little energy (about 3 times less than normal GPS applications) to ensure long battery life.
No needs to connect to the internet and all data is availables immediately in the cellphone.