HDG - Heading - Deviation & Variation

        1   2   3 4   5 6
        |   |   | |   | |
 $--HDG,x.x,x.x,a,x.x,a*hh<CR><LF>

 Field Number: 
  1) Magnetic Sensor heading in degrees
  2) Magnetic Deviation, degrees
  3) Magnetic Deviation direction, E = Easterly, W = Westerly
  4) Magnetic Variation degrees
  5) Magnetic Variation direction, E = Easterly, W = Westerly
  6) Checksum