Real time geolocation with ionic

Hello to all,
I want to create a real time geolocation app with ionic. I have a map (google map) tracing the route between two points. The user is supposed to from one of these points to anotehr. The user of the app will be able to see it’s position (movement) while moving from one point to another on the route.
Please can someone give me some advise on how to achieve this ? (sorry of the quality of my english, i’m a french spaker)