/tg/station currently comes equipped with five maps.
All maps have their own code file that is in the base of the _maps directory. Maps are loaded dynamically when the game starts. Follow this guideline when adding your own map, to your fork, for easy compatibility.
The map that will be loaded for the upcoming round is determined by reading data/next_map.json, which is a copy of the json files found in the _maps tree. If this file does not exist, the default map from config/maps.txt will be loaded. Failing that, BoxStation will be loaded. If you want to set a specific map to load next round you can use the Change Map verb in game before restarting the server or copy a json from _maps to data/next_map.json before starting the server. Also, for debugging purposes, ticking a corresponding map's code file in Dream Maker will force that map to load every round.
Anytime you want to make changes to a map it's imperative you use the Map Merging tools
/tg/station supports loading away missions however they are disabled by default.
Map files for away missions are located in the _maps/RandomZLevels directory. Each away mission includes it's own code definitions located in /code/modules/awaymissions/mission_code. These files must be included and compiled with the server beforehand otherwise the server will crash upon trying to load away missions that lack their code.
To enable an away mission open
config/awaymissionconfig.txt and uncomment one of the .dmm lines by removing the #. If more than one away mission is uncommented then the away mission loader will randomly select one the enabled ones to load.