In the automotive industry and its test laboratories, the topic of vehicle positioning and orientation as well as associated properties like accuracy, availability, continuity and integrity  is becoming increasingly important. Evidence of this can be seen in the introduction of the European eCall with its associated regulations DR (EU) 2017/79 , which includes the first mandated requirements for GNSS sensors as well as corresponding GNSS proof of conformity tests in the fields of accuracy and continuity. Similar and further specifications especially in the context of integrity of safety relevant functionalities are to be expected in the advancing development and introduction of systems in the field of driving assistance and automated driving. In addition, standardization in the field of GNSS-based positioning systems is also evolving, such as the ETSI TS 103 246 series [2-6], which has been revised in 2020 and specifies tests for the accuracy, availability, continuity and integrity GNSS based systems not only for the automotive industry but also industries under consideration of augmentation of GNSS. Conformity to these defined requirements of GNSS sensor technology is verified in internal or external laboratories. For each laboratory the calibration of its measuring instruments and used references is an essential prerequisite for the reliability of testing and conformance to its QM. Since the observations of GNSS measuring instruments or references which are used by such laboratories are not directly traceable to SI units and accordingly cannot be calibrated in accredited calibration laboratories, an assessment, validation and qualification of measuring and reference systems in this field must be performed instead of calibration. For this purpose, NavCert has developed a test procedure based on existing standards. The core of the test is, as defined for calibrations, the verification of performance values. As an example, the testing of values in the area of time and speed developed by NavCert is presented here by means of simulation. In the outlook, currently discussed possibilities in the areas of field tests are briefly presented.