The Nav4FutureMobility project aims at taking advantage of the commercial opportunity arising from the new legal framework in Germany (Level-4 Law, enacted in 2022), where Level 4 automation can become viable (for the first time) within specific operational design domains (designated operating areas) if a remote supervising entity is monitoring the operation in real-time. This project focuses on the development of a “technical supervision service”, which is based on the ability to reliably estimate the current navigation performance at the location of a given vehicle in real-time. To achieve this goal, the consortium will implement a robust positioning and navigation performance monitoring engine to increase and supervise the accuracy, integrity, availability, and robustness of the PNT solution, also including simulated LEO-positioning satellite data. A corresponding Outline Proposal has been submitted (IDEA: I-2023-00205)