Abstract: An aliquot part subdivision locator assigns reference numerals to each of 64, (or other power of 4) subdivisions of a square representing an aliquot part or an aliquot part subdivision. A chart matches each subdivision's label with a reference numeral, and two labelled discs having holes therein are set with a reference numeral aligned. When a reference numeral of the lower disc is aligned with the same reference numeral on the upper disc, and when both discs are at a predetermined angle relative to a randomly chosen radius, the aligned reference numeral appear through the holes at the appropriate position of a map in front of both discs.