17. The system of claim 15 , wherein the instructions when executed further cause the system to: estimate a reading pace associated with the user; and detect a page turn command input by the user, wherein the estimated location is determined based at least in part upon the page turn command and the reading pace.
17. The system of claim 15 , wherein the instructions when executed further cause the system to: estimate a reading pace associated with the user; and detect a page turn command input by the user, wherein the estimated location is determined based at least in part upon the page turn command and the reading pace. 19. The system of claim 17 , wherein the reading pace associated with the user is estimated based at least in part upon a time it took for the user to turn one or more previous pages in the electronic document.