Initially, there should be a route file in KML format in the phone's memory and geolocation is enabled.
The route in KML format can be created in the following programs : Google Earth, Qgis, AutoCAD Civil 3D, Global Mapper, GPSMapEdit and others.
After downloading, the application will automatically begin to determine the station line and the offset of our location relative to the loaded alignment. Points of interest can be saved to a TXT file using a template:
Picket, Offset, Mark, Description, Lat-Lon, Date and time of shooting (specific point)
The first point of the route (KML) is assigned for the beginning of the station