@type t() :: %APM.Message.LandingTarget{
  angle_x: Float32,
  angle_y: Float32,
  distance: Float32,
  frame: APM.Types.mav_frame(),
  position_valid: MAVLink.Types.uint8_t(),
  q: [Float32],
  size_x: Float32,
  size_y: Float32,
  target_num: MAVLink.Types.uint8_t(),
  time_usec: MAVLink.Types.uint64_t(),
  type: APM.Types.landing_target_type(),
  x: Float32,
  y: Float32,
  z: Float32
}