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This questionnaire has been produced by the South African National Space Agency (SANSA) and Avanti Communications Ltd. It will help us to understand the potential benefits from deploying a free-to-air satellite based augmentation system (SBAS) in the Republic of South Africa (RSA) to improve the performance of GPS and other Global Navigation Satellite Systems (GNSS - e.g. Beidou, Galileo, GLONASS). The questionnaire should take less than 15 minutes to complete.