Caution: only tested with
MSFS 2002 and 2004
 

The cursor on the Map grid is positioned over the LOD13 quadrant with the Green border. One Green arrow points down to the LOD13 Area coordinates for the position under the mouse. The second Green arrow points to the same quadrant in the sim.

Using the grid overlay, we can avoid the need to slew the aircraft carefully to define the perimeter.