Abstract: Quantum sensing is one of the core directions of current quantum technology, with the longest history, the highest maturity, and the widest applications. As the third part of the Quantum Sensing review series, this paper focuses on the current status and characteristics of quantum sensing in applications related to position-navigation-timing, remote sensing, biomedical sciences, and fundamental physics. The critical components and adaptation problems of quantum sensing are discussed. Finally, the future development and prospects of quantum sensing together with quantum information perception are envisaged.