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