The method 7, wherein a portion of said {TAIL ~ non SATPS position determination data} is acquired by an instrument for sensing {HEAD ~ a magnetic field} 
The method 7 , wherein a portion of said { TAIL ~ non SATPS position determination data } is acquired by an instrument for sensing { HEAD ~ a magnetic field }
OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD