Click on a chart and use the arrow keys to explore it through audio, text, and braille.
One layer per dial — Page Up and Page Down move between them. Each dial announces its value against the range it sits in, and the band it lands in.
Read as a region list in declared order: a regions table carries no centroids, so there is nothing to walk the map by.
With a latitude and a longitude the arrows move across the map — up is north, down is south, left is west, right is east.