Inserting the scale bar with USGS topographic basemap clearly shows the map scale is more than twice what is expected. Measure a section (square mile) with the measure tool yields nearly 3000 acres when it should only by 640. Similarly measuring the square miles of a single section should be only 1 square mile but measure tool gives 4. An inserted scale bar is also off by a similar factor. Any suggestions on why ArcMap 10.2.2 is miscalculating?