More specifically, the present invention relates to an apparatus and {HEAD ~ method} for determining {TAIL ~ the optimum source} of data for position determination when GPS data and optical data may be available 
for determining
More specifically , the present invention relates to an apparatus and { HEAD ~ method } for determining { TAIL ~ the optimum source } of data for position determination when GPS data and optical data may be available
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH