A survey system and method for determining {HEAD ~ the best source} of {TAIL ~ position data} for a particular application 
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A survey system and method for determining { HEAD ~ the best source } of { TAIL ~ position data } for a particular application
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH