The variation of {HEAD ~ such intensity} could be defined as a function of the navigation data and the data representative of {TAIL ~ one or more waypoints} 
The variation of { HEAD ~ such intensity } could be defined as a function of the navigation data and the data representative of { TAIL ~ one or more waypoints }
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL