Knowing where one is inside an office, shopping centre or other giant building, and how to get to where one wants to be, is key for fire fighters, medical personnel and other rescuers in a crisis situation. When a building is on fire rescuers don’t have time to study floor plans by entrance or elevators, and the receptionist will have fled to save her own life. Mobile GIS handhelds, equipped with GNSS, might provide a solution. However, on entering a building a GNSS receiver will fail to maintain tracking position. It is not the wavelength that foils GNSS signal take-up,...
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