VDR - Set and Drift

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 $--VDR,x.x,T,x.x,M,x.x,N*hh<CR><LF>

 Field Number: 
  1) Degress True
  2) T = True
  3) Degrees Magnetic
  4) M = Magnetic
  5) Knots (speed of current)
  6) N = Knots
  7) Checksum