Definitions GNSS

Contrary to the widely held assumption that GPS is synonymous with satellite navigation, a number of satellite-based navigation systems and procedures are available to aviation today. These offer more possibilities than conventional navigation technologies, but at the expense of also increasing the complexity of the overall system. The following overview includes the most important navigation systems and explains the basis on which new procedures will be developed.
The abbreviation GNSS stands for Global Navigation Satellite Systems and covers all types of satellite systems available for navigation. Currently the subsequently systems are available/in development