ITU-R Study Group 5 | Terrestrial Services

ITU-R Working Party 5C | Fixed wireless systems; HF systems in the fixed and land mobile services

ITU-R Working Party 5B | Maritime mobile service including the Global Maritime Distress and Safety System (GMDSS); the aeronautical mobile service and the radiodetermination service

ITU-R Working Party 5A | Land mobile service excluding IMT; amateur and amateur-satellite service

ITU-R Working Party 1C | Spectrum monitoring

ITU-R Working Party 1B | Spectrum management methodologies and economic strategies

ITU-R Working Party 1A | Spectrum engineering techniques

ITU-R Study Group 4 | Satellite services

ITU-R Working Party 4A | Efficient orbit/spectrum utilization for FSS and BSS

ITU-R Working Party 4B | Systems, air interfaces, performance and availability objectives for FSS, BSS and MSS, including IP-based applications and satellite news gathering