Overhauser vector magnetometer POS-4: application prospects In the geomagnetic measurements practice

Summary We present some development results of the absolute vector proton magnetometer POS-4 based on the switching bias magnetic fields method. Magnetometer POS-4 has a high absolute precision and stability and suitable for geomagnetic observatories and for oil and gas well directional drilling support. We discuss the some basic measurements errors and show the long-term experience in the testing on magnetic observatory Arti (Urals).