You would dock with a station, if the station isn't yours, you pay a fee of 200 pixels. Once docked, you can select a system, but only systems with a station and docking module can be selected. Then you can fly towards that system without the use of erchius fuel. While being docked, it would allow you to see if systems have a station and docking module and what kind of station it is. A docking module would be another option of station modules you have when expanding a station. This would allow you to create your own local networks.