void metricunits (on_off) SVC.C Level 1
int on_off = 1 to turn metric units on.
= 0 to turn metric units off.
metricunits() allows you to override the default scaling units established by the definition of METRIC in USER.H. 
No matter whether or not METRIC was defined when the GraphiC library was created, metricunits(0) causes GraphiC to use inch units, and metricunits(1) causes GraphiC to use metric units.