Using WebGL to make a marker based environment

Hi, it’s my first time working with threejs and i need to create an ar enviroment that incorporates location based markers, however, i can’t use gps tracking or any geolocation api, what i need to do is create my enviroment and navigate through it based on markers i create. for example if i create a marker on point (0,0) and navigate to another marker on position (0,5) he has to identifie where i am and map the rest from that point on. I cant find any related posts nor documentation.
Is there any information specific to this topic that i may use?