This example demonstrates how to display some part of the Earth in a simulation. It requires OSG Earth support from OMNeT++ 5.0 or later.
The network doesn't contain any communication related modules. It only contains two modules: a geographic coordinate system, and a visualizer.
When you run the example, you should see the detailed map of Boston downtown. Something like this: https://www.openstreetmap.org/#map=17/42.35685/-71.06632