If you enable Geo Tag on HTC One, you let the camera save the location of photo shooting or video recording. You can always check the location on the map or sort them by location. On HTC One Geo Tagging is enable by doing as follows:
1. Open "Camera" app
2. Tap the three dot icon on the screen
3. Open "Camera Options"
4. Make sure Geo-Tag photos is enabled (or disabled if you want to turn off Geo tagging)