Does the app track wherever you go? Such as, "iPhone was at this location from 2pm to 3:45pm"? Or do you have to manually add locations?

I have always wanted something that tracks my location that I can refer back to. I drive all over, and if I forget to make a note of when I arrive and leave, it becomes a CSI-style investigation, cross referencing text messages and emails and phone calls to try and determine when I arrived and left a client's office.