They may be used as a reference to place a tract relative to other tracts. These calls will show up as blue lines on the plot and will not be included in the area or perimeter calculations.
You may enter reference calls prior to the Point of Beginning (POB). In the case that you want to view more significant digits (with the knowledge that your results may have artificially inflated precision), you can check the "Show Full Precision" box. If the error is very large (greater than 10%), only two significant digits are shown if the error is very small (less than 0.1%), five significant digits are shown. Tract Plotter rounds results based on the accuracy of the plot (using percent error of the perimeter). A small box is printed at the origin of the tract (point of beginning). This can help you identify a problem call. Selecting the "Show labels" box will show simple labels on the deed calls. The closure will always be drawn in red on the plot. If the computed closure is more than 1% of the total perimeter, the closure will be printed in red. "300 feet 8 inches" should be entered as 300.66f since 8 inches is 2/3rds of a foot. If your deed gives feet and inches in its calls, you must manually convert the inches to decimals of feet, e.g. If your deed gives fractions in its calls, you must manually convert these fractions to decimal representations, e.g. Valid units are currently feet, yards (3 feet), varas (33 1/3 inches), rods/poles (16.5 feet), chains (66 feet), and links (7.92 inches), given by f, y, v, r or p, c, and l, respectively. The number may have a decimal point, but it is not required. A valid distance is simply a number followed by a unit. All deed calls must contain a space after the angle, followed by a valid distance. The only exception to the above rule is that for due North, East, Northwest, etc. Valid angles start with N or S, contain a number (which may be in the form xx for degrees only, xx.xx for degrees and minutes, or xx.xx.xx for degrees, minutes, and seconds if any of these numbers is a single digit such as 5, you may write them as such or as a two-digit number with leading zero, like 05), and end with E or W. All deed calls must start with a valid angle. Simply press your Enter or Return key to go to the next line of the input box and start a new deed call. 
All deed calls must be on their own line. All deed calls are completely case-insensitive.
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