Once the Maps extension is installed, anyone editing a MediaWiki page can include the familiar Wiki syntax with curly brackets. For example, use this code to display a point:
Or use the city name (or address) and have the geocoding performed automatically:
Since this is an extension, it is an optional addition to MediaWiki. Therefore, don't expect to be able to use maps on Wikipedia or other sites unless you know the administrator has installed the extension.
Hat tip: slashgeo