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