The LEFT and RIGHT Meta arrows zoom in and out within a coordinate system.
You can zoom out along a series of coordinates by typing M-LEFT. Now the minor cursor keys (LEFT and RIGHT arrows) will select previous and next lines of the buffer, and the major cursor keys (UP and DOWN arrows) will move by whole pages. You will also see that when you move by lines, a whole line is highlighted in a particular colour. This is the current versor selection, and its colour provides feedback on the currently selected dimension.
M-RIGHT zooms back in; the finest scale in most coordinate systems is the character.