The device 1, wherein {TAIL ~ a transmission time} and {HEAD ~ transmission location} of the navigation signals are determined using the models 
The device 1 , wherein { TAIL ~ a transmission time } and { HEAD ~ transmission location } of the navigation signals are determined using the models
OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH