Movement of position indicator on touchscreen

Some embodiments provide a method that displays a document that includes several glyphs on a touch screen display. The method receives a touch input on the touch screen display to activate a zoom tool enabling location of a position indicator within a set of associated glyphs. The method automatically divides a touch screen region for the set of associated glyphs into sub-regions. Each sub-region is associated with a position indicator location between two subsequent glyphs. A first sub-region associated with a location between first and second glyphs has a same width as a second sub-region associated with a location between the second glyph and a third glyph. The first and third glyphs do not have an equal width. The method correlates movement of the touch input across the touch screen display with the equally-spaced sub-regions in order to move the position indicator between the glyphs in the associated set.