Atlas is a compact, mobile neurosurgical navigation system that guides safe placement of external ventricular drains (EVDs) in patients with hydrocephalus or severe brain trauma. Using a mechanical measuring arm and a mobile app, it aligns the skull with the patient’s CT/MRI images with high precision, without the need for expensive infrastructure or neurosurgeons. By enabling timely, image-guided interventions in resource-limited settings, Atlas offers a practical, affordable, life-saving solution in critical neurological emergencies