{
  "type": "gps_coordinate",
  "source": "test_dataset",
  "city": "Chicago, IL",
  "data": {
    "latitude": 41.8369,
    "longitude": -87.6847,
    "accuracy": 9.0,
    "altitude": 20.0,
    "timestamp": "2026-01-14T04:10:25.563001+00:00"
  }
}