Editorial: Advancing the maturity of seamless indoor–outdoor navigation: breakthrough research in GNSS resilience, AI-driven positioning, and sensor fusion

The IEEE Journal of Indoor and Seamless Positioning and Navigation (J-ISPIN) is now in the third year as a gold open-access publication of the IEEE Sensors Council (SC), the IEEE Signal Processing Society (SPS), and the Instrumentation and Measurement Society (IMS). 2025 brings 21 original articles, seven of which are expanded versions of the best papers from the ICL-GNSS 2024 conference and two are extended versions of the best papers at the Indoor Positioning and Indoor Navigation Conference. This volume shows a vibrant and expanding field driven by technological advancements, global challenges and increasing demand for resilient positioning solutions. It reflects the journal's unique scope that bridges indoor, outdoor and seamless navigation technologies, with a strong emphasis on experimental validation, machine learning, and robustness in GNSS-denied environments.