@type t() :: %APM.Message.Deepstall{
  altitude: Float32,
  arc_entry_lat: MAVLink.Types.int32_t(),
  arc_entry_lon: MAVLink.Types.int32_t(),
  cross_track_error: Float32,
  expected_travel_distance: Float32,
  landing_lat: MAVLink.Types.int32_t(),
  landing_lon: MAVLink.Types.int32_t(),
  path_lat: MAVLink.Types.int32_t(),
  path_lon: MAVLink.Types.int32_t(),
  stage: APM.Types.deepstall_stage()
}