Suivre et tracer un itinéraire actuel sur une carte (Track and plot a current route on a map)?

[SteveJG]

There are three recommendations, the one you seem to want is the first

@SteveJG

Capture your present coordinates when your LocationChange event occurs; add it to the LineString coordinates and update the LineString.

The distance part is shown here

Compteur de kilomètres pour les trajets en voiture

Here is a way to calculate total distance shown if you use a LineString. The complete linestring distance app [linestringDistance]

What have you tried?