1. A method for accessible chart navigation using object neighborhood, the method comprising: receiving, using a processor and a memory, an input to navigate a focus away in a direction from a first object, the first object being a member of a set of objects depicted in a graphical visual chart, wherein the input is a member of a set of inputs, the set of inputs designed to access the chart without the use of a pointing device and without requiring visual inspection of the chart and the set of objects, the set of inputs further including a second input to allow return to a previous step in navigating the chart; identifying a second object to which to navigate responsive to the input, the second object being located within a neighborhood of the first object, wherein each object in the neighborhood of the first object is located at a corresponding neighborhood distance from the first object, and wherein the second object has a neighborhood distance from the first object that is shortest in the neighborhood; sorting the set of objects according to a first value associated with each object in the set of objects; sorting the set of objects according to a second value associated with each object in the set of objects; computing the neighborhood distance using a first weight in conjunction with a difference between the first values of the first and the second objects and using a second weight in conjunction with a difference between the second values of the first and the second objects, the second weight operating to restrict movement in a second direction other than the direction; and navigating to the second object such that the navigation keeps the focus within the neighborhood of the first object.