VTG - Track made good and Ground speed

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 $--VTG,x.x,T,x.x,M,x.x,N,x.x,K*hh<CR><LF>

 Field Number: 
  1) Track Degrees
  2) T = True
  3) Track Degrees
  4) M = Magnetic
  5) Speed Knots
  6) N = Knots
  7) Speed Kilometers Per Hour
  8) K = Kilometers Per Hour
  9) Checksum