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The German Indonesian Tsunami Early Warning System GITEWS follows a new approach for tsunami early warning including more sensor system types and assigned components than earlier systems. All GITEWS components have been integrated in the Indonesian Tsunami Early Warning System INATEWS, inaugurated in Jakarta on 11.11. 2008. One important component is a GNSS-based system that supports a firsthand, near real-time detection of landmass movements (onshore displacements). This paper gives a brief end-to-end overview of the completed GITEWS GNSS-components, the current works and planned next future activities such as the development and installation of low cost, single-frequency GNSS-receiver stations.