In this context, the coordinate system 100, 101, 102 can be {HEAD ~ a geographic position}, for example, including {TAIL ~ elevation} 102 
including
In this context , the coordinate system 100 , 101 , 102 can be { HEAD ~ a geographic position } , for example , including { TAIL ~ elevation } 102
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL OTH