algebras antennas(electronics) applicationsindustrielles artificialsatellites artificialsatellitesinnavigation artificialsatellitesinsurveying artificialsatellitesintelecommunication atmospheric automatictracking behavior cats communicationandtraffic congresses engineering engineering(general) equipmentandsupplies europe galileosatellitenavigationsystem geocaching(game) geodesy geographicinformationsystems gps gps<satellitengeodäsie> gpsreceivers human-animalrelationships industrialapplications inertialnavigationsystems interference international linear mathematicalmodels mathematics measurement military mobilecommunicationsystems motorvehiclefleets orbits poursuiteautomatique radio radioantennas radiowavepropagation remotesensing routesurveying securitymeasures signalprocessing signalsandsignaling signaltheory(telecommunication) socialaspects spacevehicles surface surveying systèmesd'informationgéographique technology transit transportation transportationengineering troposphäre wasserdampf watervapor