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