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