Although the distances in inches and centimeters which are provided give you sufficient accuracy for most purposes, printing variations may result in slightly off results on occasion. These proportions are included to help you find the exact locations of the map crossing points without having to use a separate calculator to convert DD.MMSS degrees to decimal degrees. The proportion the crossing point is up from the smaller reference tick is 0.0994, so the crossing point is 0.0994 times 7.57 inches, or 0.752 inches above the 45 45' reference tick. By locating both path crossing points on each map and drawing a straight line between them, you can now, by inspection of the path, pick out the terrain features which are relevant to the profile. An experienced analyst can usually minimize the number of terrain points needed for the plot.
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The profile portion of the Planner requires you to enter for each terrain point chosen the distance of that point from the westerly site and its elevation. Make marks on your straightedge for tenths of a mile or kilometer. Number each mile or kilometer using the straightedge. The distance of the westerly crossing point is from the westerly site which is used as a reference. Record each significant point of terrain, both its distance from the westerly site and its elevation, as you go along.