XDR - Cross Track Error - Dead Reckoning

        1 2   3 4            n
        | |   | |            |
 $--XDR,a,x.x,a,c--c, ..... *hh<CR><LF>

 Field Number: 
  1) Transducer Type
  2) Measurement Data
  3) Units of measurement
  4) Name of transducer
  x) More of the same
  n) Checksum