@type t() :: %APM.Message.GpsRtk{
  accuracy: MAVLink.Types.uint32_t(),
  baseline_a_mm: MAVLink.Types.int32_t(),
  baseline_b_mm: MAVLink.Types.int32_t(),
  baseline_c_mm: MAVLink.Types.int32_t(),
  baseline_coords_type: APM.Types.rtk_baseline_coordinate_system(),
  iar_num_hypotheses: MAVLink.Types.int32_t(),
  nsats: MAVLink.Types.uint8_t(),
  rtk_health: MAVLink.Types.uint8_t(),
  rtk_rate: MAVLink.Types.uint8_t(),
  rtk_receiver_id: MAVLink.Types.uint8_t(),
  time_last_baseline_ms: MAVLink.Types.uint32_t(),
  tow: MAVLink.Types.uint32_t(),
  wn: MAVLink.Types.uint16_t()
}