I have sprayed each point where a Translocator can be thrown and used to go outside the map.
each map of Busan has access to the outside and can re-enter each map, Downtown to Meka Base, Meka Base to Sanctuary etc.
DownTown:
https://i.imgur.com/u18apnn.jpg
Meka Base:
https://i.imgur.com/XEGG1qg.jpg
Sanctuary:
https://i.imgur.com/JXZqaXs.jpg