Proton Overhauser magnetometers are known as precision magnetometers of the geomagnetic field module. They are widely used in onshore and offshore magnetic surveys, magnetic observatories. The development of sensor optimization methods and a new working substance have made it possible to create a competitive small-sized Overhauser sensor for UAV applications. A displacement of 30 cubic centimeters and an optimized aluminum receiving and polarizing coil ensured a weight of up to 380 g. The efficiency of the sensor is ensured by the original working fluid with a slight saturation effect due to Heisenberg hyperpolarization with Overhauser dynamic nuclear polarization. The POS-1 aero precessional Overhauser magnetometer and the POS-2 aero gradiometer with new UAV sensors demonstrate sensitivity of up to 0.02 nT. Practical examples of application are given and the prospects for the use of a vertical gradiometer for the detection of hidden magnetic objects, UXO and non-destructive flaw detection of oil and gas pipelines are considered. Methods of preparation and processing of magnetic maps based on machining learning methods that take into account the sensitivity mask of measurements according to the QMC parameter namely measurement sensitivity prediction are discussed. The QMC is calculated by analyzing the proton precession signal by the magnetometer processor. The key sources of errors and the prospects for overcoming them are considered.