Pivoting the mat so the alignment indicator is aligned to {HEAD ~ a chosen setting} on {TAIL ~ the alignment gauge} would result in the mat being properly aligned with the target that corresponds with the setting 
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Pivoting the mat so the alignment indicator is aligned to { HEAD ~ a chosen setting } on { TAIL ~ the alignment gauge } would result in the mat being properly aligned with the target that corresponds with the setting
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH