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 Surveyor’s Units type is similar to Deg/Min/Sec but uses north, east, west, and south quadrants (quarter circles) rather than an entire circle. An angle in Deg/Min/Sec might measure 300d0′.00″, while the same angle in Surveyor’s Units would be represented as S 30d0′0.00″ E.

When you use dash-dot linetypes (ssss1) and hatching (ssss1) in a drawing, it matters to AutoCAD whether the drawing uses an imperial (inches, feet, miles, and so on) or metric (millimeters, meters, kilometers, and so on) system of measure. The MEASUREINIT and MEASUREMENT system variables control whether the linetype and hatch patterns that AutoCAD lists for you to choose from are scaled with inches or millimeters in mind as the plotting units. For both variables, a value of 0 (zero) means inches (that is, an imperial-units drawing), whereas a value of 1 means millimeters (that is, a metric-units drawing). When you start from an appropriate template drawing (as described in the section “ssss1,” later in this chapter), the system variable values will be set correctly, and you won’t ever have to think about it. For an explanation of system variables and how to set them, see ssss1.