1. 
   track-via-missile
   (from the article `rocket and missile system`) ...to an operator who sent commands to keep the target centred in the tracking screen until impact. A form of command guidance used from the 1980s by ...
   Found op http://www.britannica.com/eb/a-z/t/68
   
   
2. 
   Track-via-missile
   “Track-via-missile” (or TVM) refers to a missile guidance technique which combines features of semi-active radar homing (SARH) and radio command guidance. ==Explanation== TVM guidance requires a radar ground station and a missile with a radar receiver. As with semi-active homing missiles, the g...
   Found op http://en.wikipedia.org/wiki/Track-via-missile
   
   

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