AAM - Waypoint Arrival Alarm

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 $--AAM,A,A,x.x,N,c--c*hh<CR><LF>

 Field Number: 
  1) Status, BOOLEAN, A = Arrival circle entered
  2) Status, BOOLEAN, A = perpendicular passed at waypoint
  3) Arrival circle radius
  4) Units of radius, nautical miles
  5) Waypoint ID
  6) Checksum