The Group of Experts on the Global Sea Level Observing System (GLOSS-GE), at its Twelfth session, evaluated the status of the various GLOSS station networks including data reporting for delayed mode, high frequency, real-time data streams as well as reviewing the status of continuous measurements of vertical land movement near stations in the GLOSS Core Network. The Group reviewed recent studies based on tide gauge observations, sample sea level products and technical developments pertaining to radar gauge calibrations. The draft GLOSS Implementation Plan was reviewed and adopted by the Group. Several regional and national reports were presented and reviewed. Finally the Group reviewed present links between GLOSS and other relevant programmes, and identified its own intersessional activities for 2011–2013.