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Multiplayer take-off in GEFS 1.4c
Multiplayer take-off in GEFS 1.4c
Original author(s) Xavier Tassin
Initial release October 2010; 6 years ago (2010-10)
Stable release
2.1 / May 1, 2017; 3 months ago (2017-05-01)
Development status Active
Platform Open Web Platform
Type Amateur flight simulation

GeoFS is a free flight simulator based on the Cesium WebGL Virtual Globe[1] which makes use of aerial imagery and provides a multi-player environment for pilots to interact with each other. GeoFS is exclusively built with web technologies and only requires a web browser to run.


Created by Xavier Tassin, it was launched in October 2010.[2] It was originally built on the Google Earth plug-in as GEFS-Online (Google Earth Flight Simulator).[3] On September 1, 2015, support for the Google Earth plugin ended, which nearly resulted in a complete shutdown of GEFS-Online. In January 2016, in light of the Google Earth plugin's termination, GEFS-Online migrated to CesiumJS, an open source 3D globe platform.[4] In 2017, the name of the simulator was changed to GeoFS because of the no longer existing connection between it and the Google Earth plug-in.

Virtual airlines[edit]

GeoFS is a flight simulator used for quite a few virtual airlines, simulating real life airline operations. The number of virtual airlines has become quite substantial, triggering the need for a separate sub-forum on the GeoFS forums. The types of virtual airlines can range from completely fictional, to virtual airlines based on currently running, real world airlines.