In this paper hybrid positioning means the combination of satellite-based positioning (SP) and inertial positioning (IP). Approaches for inertial positioning - which must not be mixed up with inertial navigation (INS) - are discussed first based upon the distribution of the free fall acceleration g on the surface of Earth, and secondly upon the Eotvos effect and the daily and yearly rotations of Earth. Pros and cons are considered, with recommendations derived. Technologies available allow for designing an IP demonstrator already now. In the future IP may become a drift-free supplement to INS and eventually even a competitive alternative to SP for a number of applications.
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