Based on the GPS location, the program tells you how far you are from the LHS, how far you are from the nearest mileage marker and where it is. It also allows you to commute within a certain kilometer and shows where you are on the trail.
The application also informs about traffic on the LHS and adjacent standard-gauge routes based on information from users.
More on this in this video:
https://youtu.be/2QfTPqUtd7Y