GUIDE is a Testing Laboratory specialized in geolocation. These missions are dedicated to the evaluation, validation and certification of solutions based on GNSS technologies. GUIDE offers engineering services for performing tests, implementing test means and consultancy to optimize the accuracy and reliability of positioning measurements. GUIDE addresses most of the transport sectors with unique metrology methodologies to assess all types of vehicles, in particular within constrain areas (Bridges, foliage, infrastructure,…) Its testing techniques are conducted in real or reconstructed environments, the most representative of the considered use cases. They are distinguished by their ability to repeat measurement operations and to compare the results obtained from different devices to be tested. Since 2018, GUIDE is a business company associated with 6 companies and 3 experts specialized in the field of GNSS.