The 9200-G2 is a combined position and correction receiver that is not limited to using the GPS constellation. GLONASS operation may be enabled by a (chargeable) software unlock, significantly increasing the number of satellites available for a position solution. The 9200-G2 is out of production, but still supported; alternatively the 9205-GNSS is recommended as a direct replacement which can use all available GNSS constellations.