VPW - Speed - Measured Parallel to Wind

        1   2 3   4 5
        |   | |   | |
 $--VPW,x.x,N,x.x,M*hh<CR><LF>

 Field Number: 
  1) Speed, "-" means downwind
  2) N = Knots
  3) Speed, "-" means downwind
  4) M = Meters per second
  5) Checksum